Safety data sheet documentation for chlorine (CAS 7782-50-5), compiled to REACH Annex II with classification read against the harmonised entry in CLP Annex VI (H270, H331, H335, H315). Two options: a working draft sent by e-mail immediately, or a signed card issued within 72 hours of complete input. The item supplied is a document — MolGod.org does not sell, supply or ship chemical substances.
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Section 9 — physicochemical properties: 8 of 22 established.
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Identity CAS · EC · IUPAC · synonyms · molecular formula · molecular weight
Structure 2D · 3D · SMILES · InChI · InChIKey
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References literature, with DOI where a DOI exists
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A digital PDF safety data sheet in the sixteen-section structure of REACH Annex II (Regulation 1907/2006).
Substance identification, hazard classification, physicochemical, toxicological and ecological information, and regulatory references.
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sources.txt — every citation with the date it was read.
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3D model Chlorine, CAS 7782-50-5, molecular formula Cl2, molar mass 70.90 g/mol
Data transcribed from regulatory registers and technical literature, with the source and edition stated. It does not replace the supplier's safety data sheet. Fields without a recorded source are marked as such.
📊 Physicochemical data — CAS 7782-50-5
📊Physicochemical properties
Quick Reference
Formula:Cl2
MW:70.9 g/mol
CAS:7782-50-5
Appearance:Yellowish-green gas
Odour:Suffocating odor
🔬 Advanced Properties
Chemical Identifiers
SMILES:ClCl
Last updated: 2026-08-25
📐Physical & Chemical Properties (DB)
4 fields MolGod Score: No source
PubChem. National Center for Biotechnology Information (NIH/NLM), chemical compound database. ↗
applies to: Molecular formula · Molecular weight · LogP (lipophilicity) · SMILES · InChIKey
NIST. Chemistry WebBook, SRD 69. National Institute of Standards and Technology. ↗
applies to: Boiling point
(2026). "Which halogen to choose? Comparing the effects of chlorine and fluorine as bioisosteric substituents in drug design.". https://doi.org/10.1039/d5sc07348k
et al.. (2026). "Multisite atomic-chlorine-passivation stabilizes perovskite interfaces for efficient H2O2 photosynthesis from seawater.". https://doi.org/10.1038/s41467-026-70503-2
et al.. (2026). "A Dual GC-MS and LC-MS/MS Analytical Strategy for Evaluating Free Chlorine Toxicity in Aqueous Samples.". https://doi.org/10.1002/rcm.70151
et al.. (2026). "Novel Smartphone Paper Sensor for One Health: Monitoring Free Chlorine in Water and Exhaled Breath Condensate.". https://doi.org/10.3390/s26103066
et al.. (2026). "Advanced Chlorine Photolysis for Carbamazepine Degradation: Tuning Radicals for Dissolved Organics.". https://doi.org/10.1021/acsestwater.5c01498
db:Europe PMC
(2026). "Which halogen to choose? Comparing the effects of chlorine and fluorine as bioisosteric substituents in drug design.". https://doi.org/10.1039/d5sc07348k →
db:Europe PMC
et al.. (2026). "Multisite atomic-chlorine-passivation stabilizes perovskite interfaces for efficient H2O2 photosynthesis from seawater.". https://doi.org/10.1038/s41467-026-70503-2 →
db:Europe PMC
et al.. (2026). "Chlorine radical-mediated electrochemical propylene epoxidation from seawater.". https://doi.org/10.1038/s41467-026-70733-4 →
db:Europe PMC
et al.. (2026). "Planar hexacoordinate chlorine.". https://doi.org/10.1039/d5sc09167e →
db:Europe PMC
et al.. (2026). "A Dual GC-MS and LC-MS/MS Analytical Strategy for Evaluating Free Chlorine Toxicity in Aqueous Samples.". https://doi.org/10.1002/rcm.70151 →
db:Europe PMC
et al.. (2026). "Novel Smartphone Paper Sensor for One Health: Monitoring Free Chlorine in Water and Exhaled Breath Condensate.". https://doi.org/10.3390/s26103066 →
db:Europe PMC
et al.. (2026). "A chlorine releasing solution as an alternative for dental biofilm control.". https://doi.org/10.1038/s41598-026-49642-5 →
db:Europe PMC
et al.. (2026). "Advanced Chlorine Photolysis for Carbamazepine Degradation: Tuning Radicals for Dissolved Organics.". https://doi.org/10.1021/acsestwater.5c01498 →
db:Europe PMC
(2026). "Surface morphology modulation in chlorine-doped diisopropylammonium bromide film via Cl-induced domain refinement.". https://doi.org/10.1016/j.isci.2026.116245 →
db:Europe PMC
et al.. (2026). "Compressed Co-O Bonds Resist Chlorine Corrosion to Enhance the Stability of Chlorine-Involved Anodic Reactions.". https://doi.org/10.1002/anie.202519520 →
db:Europe PMC
et al.. (2026). "Effects of Foliar Application of Iron Chlorine e6 on the Starch Physicochemical Properties and In Vitro Digestibility of Waxy Maize.". https://doi.org/10.1002/fsn3.71978 →
db:Europe PMC
et al.. (2026). "Controlled release of chlorine dioxide from α-cyclodextrin complexes embedded in poly(lactic acid)/poly(butylene adipate-co-butylene terephthalate) films for sustainable food packaging.". https://doi.org/10.1016/j.fochx.2026.103982 →
db:doaj
Kuanchang He, Wei Li, Jinxing Ma et al.. (2026). "Strain-induced faceting of Ti4O7 for active chlorine electrosynthesis". Nature Communications. https://doi.org/10.1038/s41467-026-75687-1 →
db:doaj
Isni Arliyani, Hilmi Iqlima Khoirunnisa, Heri Septya Kusuma et al.. (2026). "Impact of chlorine dioxide (ClO2) on reverse osmosis (RO) membrane integrity: degradation behavior, surface property changes, and implications for biofouling control". RSC Advances. https://doi.org/10.1039/d5ra09010e →
db:arxiv
Danial Shafizadeh, Misagh Ghezellou, Viktor M. Bobal et al.. (2026). "Spin-active chlorine-related centers in 4H-SiC with telecom-band emissions". arXiv (2602.08854v1).
db:Europe PMC
et al.. (2026). "Electrosynthesis of Chlorine Oxidant From Direct Seawater Electrolysis via High-Entropy Intermetallic.". https://doi.org/10.1002/asia.70864 →
db:Europe PMC
et al.. (2025). "Sustainable chlorine cycle enabled by single atom catalysis.". https://doi.org/10.1038/s41467-025-65505-5 →
db:Europe PMC
et al.. (2025). "Colorimetric detection of chloroperoxyl radical in reactive chlorine species solutions.". https://doi.org/10.1371/journal.pone.0334046 →
db:Europe PMC
et al.. (2025). "The Engineered Synthesis and Enhancement of Nitrogen and Chlorine Co-Doped Fluorescent Carbon Dots for the Sensitive Detection of Quercetin.". https://doi.org/10.3390/ma18112669 →
db:openalex
Ambalathumpara Raman Soman, G. Sundararaj. (2015). "Accidental Release of Chlorine from a Storage Facility and an On‐Site Emergency Mock Drill: A Case Study". The Scientific World JOURNAL. https://doi.org/10.1155/2015/483216 →
Regulatory status of the substance
This substance is subject to regulatory requirements: hazardous waste management (BDO — national rule, Poland); transport of dangerous goods (ADR/RID/IMDG). Details in the \"Regulatory Status (REACH/ECHA/CLP)\" section and on the SDS. Regulatory information — does not restrict purchase in this store.
🧮 Stoichiometry Calculator
🧪 Chemical Data
CAS Number
7782-50-5
Molecular formula
Cl2
Molar mass
70.90 g/mol
IUPAC name (EN)
molecular chlorine
SMILES
ClCl
InChIKey
KZBUYRJDOAKODT-UHFFFAOYSA-N
📚 Related literature (20 articles)
Matched automatically from public bibliographic databases by text similarity. Not curated for this substance, and not part of the safety data sheet.
PubChem. National Center for Biotechnology Information (NIH/NLM), chemical compound database. ↗
applies to: PubChem CID · InChIKey · InChI · SMILES
ECHA. EC Inventory — EINECS, ELINCS, NLP and List Numbers assigned under REACH. Helsinki: European Chemicals Agency. ↗
applies to: EC Number
Further reading
Publications thematically related to this CAS. They are not the source of any value shown on this card.
Extended Bibliography (3)
★★★★★CANONICAL_PAPERS💰 Paywall (probable)✓ verifiedKrawczyk-Łebek A; Żarowska B; Janeczko T et al.. 2024. "Antimicrobial Activity of Chalcones with a Chlorine Atom and Their Glycosides." International journal of molecular sciences.link[accessed: 2026-10-11]
★★★★½CANONICAL_PAPERS💰 Paywall (probable)✓ verifiedZhang Y; Qian Y; Wen Y et al.. 2024. "In Situ Preparation of Chlorine-Regenerable Antimicrobial Polymer Molecular Sieve Membranes." Molecules (Basel, Switzerland).link[accessed: 2026-10-11]
Spectra are fetched on demand from 9 sources. Each spectrum is stored in our database — the next time it is opened there are zero requests to the external API. Download JCAMP-DX / CSV / PNG for every spectrum without searching.
Data is fetched once (JCAMP-DX parser) and stored in the plugin's local database. No duplicate downloads, no NIST queries on subsequent openings. Licences respected (only a deep link plus our own visualisation is published).
Data retrieved live from multiple sources (priority chain). JCAMP-DX / CSV / PNG available for download under each spectrum.
IR — Fourier-transform infrared
Loading IR — Fourier-transform infrared…
MS — Mass spectrometry (EI 70eV)
Loading MS — Mass spectrometry (EI 70eV)…
NMR spectrum — not applicable (inorganic compound)
For CAS 7782-50-5, the structure contains no carbon atoms or C–H bonds. 1H/13C NMR spectroscopy applies to organic compounds — for an inorganic substance (salt, mineral acid), predicting 1H/13C shifts is not applicable.
🔎 Spectrum Search (JCAMP-DX)
Upload a JCAMP-DX file (.jdx, .dx, .jcm) — the system will calculate the cosine similarity against all spectra in the database and display the TOP 10 matches.
📚 Bibliography (Chicago)
McLafferty, Fred W., ed. 2018. Wiley Registry of Mass Spectral Data. 11th ed. Hoboken, NJ: Wiley. A reference MS library (~775k spectra).
Stein, Stephen E., and Donald R. Scott. 1994. "Optimization and Testing of Mass Spectral Library Search Algorithms for Compound Identification." Journal of the American Society for Mass Spectrometry 5 (9): 859–866. The cosine + dot-product algorithm of NIST MS Search.
McDonald, Robert S., and Paul A. Wilks Jr. 1988. "JCAMP-DX: A Standard Form for Exchange of Infrared Spectra in Computer Readable Form." Applied Spectroscopy 42 (1): 151–162. The JCAMP-DX specification (extended to 5.01 for NMR/MS).
McLafferty, Fred W., and František Tureček. 1993. "Interpretation of Mass Spectra." 4th ed. Mill Valley, CA: University Science Books. Cosine-similarity matching and MS fragmentation — the foundation of the search algorithm.
Sumner, Lloyd W., Alexander Amberg, Dave Barrett, Michael H. Beale, Richard Beger, Clare A. Daykin, Teresa W.-M. Fan, et al. 2007. "Proposed Minimum Reporting Standards for Chemical Analysis." Metabolomics 3 (3): 211–221. MSI Level 1-4 — confidence-level standards for spectral matching.
Stein, Stephen E. 1999. "An Integrated Method for Spectrum Extraction and Compound Identification from Gas Chromatography/Mass Spectrometry Data." Journal of the American Society for Mass Spectrometry 10 (8): 770–781. The AMDIS algorithm — deconvolution + library match (NIST).
Lindon, John C., George E. Tranter, and David W. Koppenaal, eds. 2017. "Encyclopedia of Spectroscopy and Spectrometry." 3rd ed. Amsterdam: Academic Press. Encyclopedia entries on spectral library searching.
Smith, Brian C. 2011. "Fundamentals of Fourier Transform Infrared Spectroscopy." 2nd ed. Boca Raton, FL: CRC Press. FT-IR and the JCAMP-DX format for transmission spectra.
Larkin, Peter. 2017. "Infrared and Raman Spectroscopy: Principles and Spectral Interpretation." 2nd ed. Amsterdam: Elsevier. Principles of IR/Raman library matching and peak preprocessing.
Structural properties
Loading structural data...
❓ Frequently asked questions (10)
What is Chlorine?
Chlorine (CAS 7782-50-5) is a chemical compound with the molecular formula Cl2 and a molecular weight of 70.90 g/mol. The chemical data comes from PubChem (National Institutes of Health, USA).
Helpful?
What is the CAS number of Chlorine?
The CAS number for Chlorine is 7782-50-5. A CAS Registry Number is the standard identifier for a chemical substance in scientific literature and in trade.
Helpful?
What is the chemical formula of Chlorine?
The molecular formula of Chlorine is Cl2. Its molecular weight is 70.90 g/mol.
Helpful?
What is the melting point of Chlorine?
The melting point of Chlorine is -101.5.
Helpful?
What is the boiling point of Chlorine?
The boiling point of Chlorine is -33.8112.
Helpful?
What is the density of Chlorine?
The density of Chlorine is 1.4899.
Helpful?
What are the physicochemical properties of Chlorine?
Physicochemical properties of Chlorine are available in the chemical data section on the product page.
Helpful?
Is Chlorine hazardous?
Chlorine is classified as hazardous (signal word: Danger); its pictograms and hazard statements are set out in section 2 of its safety data sheet. Read the safety data sheet before use and follow the handling precautions it states.
Helpful?
How should Chlorine be stored?
Chlorine should be stored as its safety data sheet directs \— typically in a dry, cool, well-ventilated place, away from heat and from materials it is incompatible with.
Helpful?
Is Chlorine safe to use?
Safety of Chlorine depends on concentration and exposure route. Review the GHS classification in the Safety Data Sheet (SDS).
Helpful?
➕ Suggest a question
Download structure files
Molecular structure files from the PubChem database (NIH). Compatible with Avogadro, PyMOL, Jmol, and ChemDraw.
Cohen ER, Cvitaš T, Frey JG, Holmström B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor AJ (2007)
g/L ↔ molarity
c (mol/L) = (g/L) / MW
±0.1% (depends on MW precision)
Cohen ER, Cvitaš T, Frey JG, Holmström B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor AJ (2007)
mmol/L ↔ molarity
c (mol/L) = mmol/L × 10⁻³
Exact
Cohen ER, Cvitaš T, Frey JG, Holmström B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor AJ (2007)
Celsius ↔ Kelvin
T(K) = t(°C) + 273.15
±0.01 K (ITS-90 scale)
BIPM (Bureau International des Poids et Mesures) (2019)
Celsius ↔ Fahrenheit
T(°F) = T(°C) × 9/5 + 32
±0.1 °F
Thompson A, Taylor BN (2008)
density-corrected % ↔ molarity
c (mol/L) = (%w/w × ρ × 10) / MW, ρ in g/mL
±0.1% when ρ known to 3 decimals
Cohen ER, Cvitaš T, Frey JG, Holmström B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor AJ (2007)
📚 Bibliography (8 authoritative sources)
Thompson A, Taylor BN (2008). Guide for the Use of the International System of Units (SI). NIST Special Publication 811 · DOI: 10.6028/NIST.SP.811-2008 → Primary SI standard for US scientific usage
Cohen ER, Cvitaš T, Frey JG, Holmström B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor AJ (2007). Quantities, Units and Symbols in Physical Chemistry — The IUPAC Green Book. RSC Publishing, 3rd ed. · DOI: 10.1039/9781847557889 · ISBN: 978-0-85404-433-7 → Canonical IUPAC guide for chemistry quantities/units
BIPM (Bureau International des Poids et Mesures) (2019). The International System of Units (SI), 9th edition. BIPM · ↗ → International SI definitions (incl. redefined kilogram 2019)
ISO/IEC (2022). Quantities and units — Part 1: General. International Organization for Standardization — ISO 80000-1:2022 · ↗ → General rules for physical quantities and units
ISO/IEC (2019). Quantities and units — Part 9: Physical chemistry and molecular physics. International Organization for Standardization — ISO 80000-9:2019 · ↗ → Concentration / molality / amount-of-substance conventions
Tiesinga E, Mohr PJ, Newell DB, Taylor BN (2021). CODATA recommended values of the fundamental physical constants: 2018. Rev. Mod. Phys. 93(2):025010 · DOI: 10.1103/RevModPhys.93.025010 → Avogadro, gas constant, molar volume (2019 SI revision)
IUPAC (2019). Compendium of Chemical Terminology — the IUPAC Gold Book (online). IUPAC · DOI: 10.1351/goldbook → Definitions of mass fraction, molality, normality, ppm, activity
Mills IM, Cvitaš T, Homann K, Kallay N, Kuchitsu K (1988). Quantities, Units and Symbols in Physical Chemistry. Blackwell Scientific Publications, 1st ed. · ISBN: 0-632-01773-5 → Historical predecessor of IUPAC Green Book
Data limitations notice. The safety information on this page is for reference only and does not replace a full safety data sheet (SDS). Before using the product, consult the manufacturer's current safety data sheet and the GHS/CLP guidance. The CLP classification applies to the pure bulk substance, not to commercial formulations.
GHS/CLP classification — Regulation (EC) No 1272/2008 + UN GHS Rev. 9 (2021).
P220 — Keep away from clothing and other combustible materials
✓ Harmonised classification pursuant to Annex VI of the CLP Regulation (EC) 1272/2008 (official, binding classification). Index number: 017-001-00-7.
Reference (Chicago): European Chemicals Agency. "chlorine, Index No. 017-001-00-7." In Table 3 of Annex VI to Regulation (EC) No 1272/2008 (CLP Regulation), 23rd Adaptation to Technical Progress (harmonised list as of 2026-07-07). Helsinki: European Chemicals Agency, 2026. https://echa.europa.eu/information-on-chemicals/annex-vi-to-clp.
Translations: CLP Regulation (EC) 1272/2008, Annexes III and IV. Data: PubChem/NLM.
☢️ Toxicological data (IARC + EPA CTX)
🧬 IARC Carcinogen Classification
IARC classification:
No individual IARC entry for this CAS
No separate IARC monograph in the checked lists — this is NOT confirmation of a lack of carcinogenicity. Check the CLP/GHS classification (CMR / GHS section).
🌍 Ecotoxicology & environmental fate (SDS sec. 8/12)
LC₅₀ (fish):
0.014 mg/L (Oncorhynchus mykiss, 96 h)
EC₅₀ (Daphnia):
0.0186 mg/L (Daphnia magna, 24 h)
EC₅₀ (algae):
5.1 mg/L (Macrocystis pyrifera, 96 h)
Source: U.S. EPA ECOTOX Knowledgebase — https://cfpub.epa.gov/ecotox/
📚 Sources:
IARC Monographs (WHO) Last verified: 2026-08-25
(2026). "Which halogen to choose? Comparing the effects of chlorine and fluorine as bioisosteric substituents in drug design.". https://doi.org/10.1039/d5sc07348k [DOI]
et al.. (2026). "Multisite atomic-chlorine-passivation stabilizes perovskite interfaces for efficient H2O2 photosynthesis from seawater.". https://doi.org/10.1038/s41467-026-70503-2 [DOI]
et al.. (2026). "Chlorine radical-mediated electrochemical propylene epoxidation from seawater.". https://doi.org/10.1038/s41467-026-70733-4 [DOI]
et al.. (2026). "Planar hexacoordinate chlorine.". https://doi.org/10.1039/d5sc09167e [DOI]
et al.. (2026). "A Dual GC-MS and LC-MS/MS Analytical Strategy for Evaluating Free Chlorine Toxicity in Aqueous Samples.". https://doi.org/10.1002/rcm.70151 [DOI]
et al.. (2026). "Novel Smartphone Paper Sensor for One Health: Monitoring Free Chlorine in Water and Exhaled Breath Condensate.". https://doi.org/10.3390/s26103066 [DOI]
et al.. (2026). "A chlorine releasing solution as an alternative for dental biofilm control.". https://doi.org/10.1038/s41598-026-49642-5 [DOI]
et al.. (2026). "Advanced Chlorine Photolysis for Carbamazepine Degradation: Tuning Radicals for Dissolved Organics.". https://doi.org/10.1021/acsestwater.5c01498 [DOI]
(2026). "Surface morphology modulation in chlorine-doped diisopropylammonium bromide film via Cl-induced domain refinement.". https://doi.org/10.1016/j.isci.2026.116245 [DOI]
et al.. (2026). "Compressed Co-O Bonds Resist Chlorine Corrosion to Enhance the Stability of Chlorine-Involved Anodic Reactions.". https://doi.org/10.1002/anie.202519520 [DOI]
et al.. (2026). "Effects of Foliar Application of Iron Chlorine e6 on the Starch Physicochemical Properties and In Vitro Digestibility of Waxy Maize.". https://doi.org/10.1002/fsn3.71978 [DOI]
et al.. (2026). "Controlled release of chlorine dioxide from α-cyclodextrin complexes embedded in poly(lactic acid)/poly(butylene adipate-co-butylene terephthalate) films for sustainable food packaging.". https://doi.org/10.1016/j.fochx.2026.103982 [DOI]
Kuanchang He, Wei Li, Jinxing Ma et al.. (2026). "Strain-induced faceting of Ti4O7 for active chlorine electrosynthesis". Nature Communications. https://doi.org/10.1038/s41467-026-75687-1 [DOI]
Isni Arliyani, Hilmi Iqlima Khoirunnisa, Heri Septya Kusuma et al.. (2026). "Impact of chlorine dioxide (ClO2) on reverse osmosis (RO) membrane integrity: degradation behavior, surface property changes, and implications for biofouling control". RSC Advances. https://doi.org/10.1039/d5ra09010e [DOI]
et al.. (2026). "Electrosynthesis of Chlorine Oxidant From Direct Seawater Electrolysis via High-Entropy Intermetallic.". https://doi.org/10.1002/asia.70864 [DOI]
🚨 Emergency procedure — chemical spillOxidizing
CAS 7782-50-5GHS:H270H331H335H315H319H400⚠️ EVACUATION (10m)💨 Ventilation
🥽 PPE — Personal protective equipment
Goggles:Yes
Suit:lab coat
Face shield:Yes
Respirator:gas/vapour filter per EN 14387 (select type B/E/K per substance nature) — NOT FFP — EN 14387:2004+A1:2008
📦 Small spill (<1L) — absorbent: vermiculite/perlite (mineral — NOT organic)
⚠️ GENERIC procedure derived from the GHS classification (no curated data for this CAS). Always follow the supplier's current Safety Data Sheet (SDS).
1. Remove combustible and organic materials from the area (paper, wood, solvents).
2. Cover with an inert MINERAL absorbent (vermiculite, perlite, sand) — NEVER sawdust/paper.
3. Collect into a non-combustible container; protect from contact with reducing agents and metals.
4. Wash the area with water; treat residues and absorbent as hazardous waste.
Additional properties from GHS:
• toxic — respiratory protection, avoid contact
• irritant — avoid skin/eye contact and dust inhalation
• hazardous to the environment — prevent entry into drains, soil and water
🛢️ Large spill (>1L) ⚠️ Hazardous material
1. Evacuate the area; remove all ignition sources and combustible materials.
2. Contain with a mineral absorbent; do NOT use organic materials for collection.
3. Collect mechanically into a labeled UN container; hand over to an authorized company (BDO — national rule, Poland).
4. Report the incident per the OHS procedure; on release to the environment notify the Regional Environmental Inspectorate (WIOŚ) (national rule — Poland).
🩹 First aid
🧴 Skin
1. Remove contaminated clothing.
2. Rinse the skin with plenty of water for ≥15 min.
3. The substance may be absorbed through the skin — monitor symptoms / see a doctor.
👁️ Eyes
1. Rinse with water for ≥15 min, eyelids held open; remove contact lenses.
2. See an ophthalmologist if irritation persists.
🫁 Inhalation
1. Move the casualty to fresh air, comfortable position.
2. If short of breath — oxygen / doctor.
3. Delayed pulmonary edema possible — observe.
🍽️ Ingestion
1. Rinse the mouth with water; do NOT induce vomiting.
2. Poison Control Center (Poland): +48 42 631 47 24.
🌍 Environment:
Water: High; Soil: Medium; ❌ Do not release into drains; Waste Code: 16 05 06*
📚 Scientific references (Chicago Author-Date) — 8
European Chemicals Agency (ECHA). 2020. Guidance on the Compilation of Safety Data Sheets — Section 6: Accidental Release Measures. ECHA.
[link ↗]
European Parliament and Council. 2008. Regulation (EC) No 1272/2008 (CLP) — Hazard classes and H-statements. Official Journal of the European Union L 353.
[link ↗]
National Institute for Occupational Safety and Health (NIOSH). 2023. Pocket Guide to Chemical Hazards — NIOSH Pocket Guide to Chemical Hazards. CDC.
[link ↗]
U.S. Occupational Safety and Health Administration. 2024. 29 CFR 1910.120 — Hazardous Waste Operations and Emergency Response (HAZWOPER). U.S. Code of Federal Regulations.
[link ↗]
National Fire Protection Association. 2018. NFPA 472: Standard for Competence of Responders to Hazardous Materials/Weapons of Mass Destruction Incidents. NFPA.
[link ↗]
European Parliament and Council. 2012. Directive 2012/18/EU on the Control of Major-Accident Hazards Involving Dangerous Substances (Seveso III). Official Journal of the European Union L 197: 1–37.
[link ↗]
U.S. National Institute for Occupational Safety and Health. 2024. NIOSH Pocket Guide to Chemical Hazards. Centers for Disease Control and Prevention.
[link ↗]
European Chemicals Agency. 2020. Guidance on the Compilation of Safety Data Sheets (SDS), Version 3.1. ECHA.
[link ↗]
Sources: GHS/CLP classification (PubChem/SDS) — generic fallback · ECHA Guidance on SDS (section 6) · NIOSH Pocket Guide.
Indicative data only — in an emergency, always follow the supplier's instructions and local occupational health and safety (OHS) regulations.
☠️ Visual PPE guide (personal protective equipment)Toxic
🧤 Gloves
Double nitrile (double-glove) >0.2 mm (each layer) EN 374-1 typ B
Replace every 30 min or immediately after contact
👁️ Safety Glasses / Goggles
EN 166 B
Full side protection; sealed goggles for toxic dusts
🥼 Lab Coat / Coverall
Full buttoned lab coat + disposable sleeves EN 13688
Airborne concentration < OEL (NDS) per Dz.U. 2024 item 1017
😷 Respirator Required
P2 half-mask (fine aerosols) or P3 (>10× OEL); full-face mask with A1B1E1K1-P3 filter for toxic organic vapors
📚 Scientific references (Chicago Author-Date)
European Committee for Standardization (CEN). 2016. EN 374-1:2016 — Protective gloves against dangerous chemicals and micro-organisms — Part 1: Terminology and performance requirements for chemical risks. CEN, Brussels. EN 374-1:2016. [link ↗] — Classification of chemical-resistant gloves type A/B/C; JKLPT permeation tests
European Committee for Standardization (CEN). 2001. EN 166:2001 — Personal eye-protection — Specifications. CEN, Brussels. EN 166:2001. [link ↗] — Markings: B = medium-energy impact, T = extreme temperatures, 9 = molten metals and hot solids
European Committee for Standardization (CEN). 2009. EN 14605:2005+A1:2009 — Protective clothing against liquid chemicals — Performance requirements for clothing with liquid-tight (Type 3) or spray-tight (Type 4) connections. CEN, Brussels. EN 14605:2009. [link ↗] — Type 3 (jet-tight) and Type 4 (spray-tight) protection against liquid chemicals
National Institute for Occupational Safety and Health (NIOSH). 2017. Recommendations for Chemical Protective Clothing: A Companion to the NIOSH Pocket Guide. U.S. Department of Health & Human Services / CDC. [link ↗] — Practical guide to CPC (chemical protective clothing) selection per substance and exposure scenario
Occupational Safety and Health Administration (OSHA). 2011. Personal Protective Equipment — General requirements. U.S. Department of Labor — 29 CFR 1910.132. 29 CFR 1910.132. [link ↗] — The employer must provide PPE + training + a documented written hazard assessment
ℹ️ Regulatory obligations checklist for CAS 7782-50-5.
Status based on: ADR 2025 (Table A), REACH Annex XVII, CLP Annex VI (harmonised classification), hazard class from the m14-spill DB, SVHC, GIS and the Polish OEL list. Principle: no data = no claim (we do NOT declare "no restrictions" without a basis).
✅SDS (Safety Data Sheet) availablefulfilled
How to comply: Requirement: current SDS compliant with Reg. 1907/2006 (REACH) Annex II, 16-section format.
Legal basis: Regulation (EC) No 1907/2006 (REACH) Art. 31 + Annex II
▣Compliant CLP label (pictograms + signal word + H/P)required
How to comply: The label must include: GHS pictograms, the signal word (Danger/Warning), hazard (H) and precautionary (P) statements, and manufacturer details. Required since 2010 (substances) and 2015 (mixtures). For this substance a HARMONISED CLASSIFICATION applies (CLP Annex VI) — see below; it takes precedence over self-classification.
Legal basis: Regulation (EC) No 1272/2008 (CLP) Art. 17-33 + Annex VI (harmonised classification)
How to comply: Road transport compliant with ADR 2025: Class 2.3, UN 1017, PG -. Required: DGSA safety adviser certificate, class + UN labels, transport documents, packaging compliant with Chapter 6.
Legal basis: ADR 2025 European Agreement + Polish Act of 19 August 2011 on the Transport of Dangerous Goods National rules — Poland
🔵REACH registration (>1 t/year EU import)conditional
How to comply: Importers/manufacturers ≥1 tonne/year must register the substance with ECHA (technical dossier + Chemical Safety Report if ≥10 t). Check the ECHA Annex VI / registered substances list.
Legal basis: Regulation (EC) No 1907/2006 (REACH) Art. 5-22
⚪REACH Annex XVII (use/marketing restrictions)not applicable
How to comply: Checked against the harmonised classification (CLP Annex VI): the substance has no CMR category 1A/1B classification, so it is NOT subject to the general ban on sale to the general public under entries 28–30 of Annex XVII. NOTE: specific (non-CMR) Annex XVII entries are not covered by the MOL-GOD dataset (incomplete dataset) — if in doubt, check the consolidated Annex XVII on the ECHA website.
Legal basis: Regulation (EC) No 1907/2006 (REACH) Annex XVII — restrictions on manufacture, placing on the market and use
European Parliament and Council. 2008. Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures (CLP). Official Journal of the European Union L 353/1. CLP Regulation 1272/2008. [link ↗] — Classification, labelling and packaging of substances + mixtures (GHS implementation in the EU)
European Parliament and Council. 2006. Regulation (EC) No 1907/2006 concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH). Official Journal of the European Union L 396/1. REACH Regulation 1907/2006. [link ↗] — REACH — registration, evaluation and authorisation of chemicals; SVHC; SDS Annex II
Ministerstwo Rodziny i Polityki Społecznej Rzeczypospolitej Polskiej. 2024. Rozporządzenie Ministra Rodziny i Polityki Społecznej z dnia 4 września 2024 r. w sprawie najwyższych dopuszczalnych stężeń i natężeń czynników szkodliwych dla zdrowia w środowisku pracy. Dziennik Ustaw RP 2024 poz. 1017. National rules — Poland[link ↗] — NDS and NDSCh for ~600 chemical substances — current Polish occupational exposure limits
United Nations Economic Commission for Europe (UNECE). 2025. European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR), 2025 Edition. United Nations, Geneva. ADR 2025. [link ↗] — International agreement on the road transport of dangerous goods — UN numbers, classes, packaging
📚 Consolidated scientific references — Chicago Author-Date 10 sources
References collected from all Safety Hub tabs. CAS: 7782-50-5 ·
PubChem ↗
Parlament Europejski i Rada UE. 2008. "Regulation (EC) nr 1272/2008 w sprawie klasyfikacji, oznakowania i pakowania substancji (CLP)." Dz.Urz. UE L 353. [↗]
GHS, Regulations
United Nations Economic Commission for Europe (UNECE). 2021. "Globally Harmonized System of Classification and Labelling of Chemicals (GHS), Ninth Revised Edition." United Nations, Geneva. [↗]
GHS
Goldfrank, Lewis R., Robert S. Hoffman, Mary Ann Howland, et al.. 2019. "Goldfrank's Toxicologic Emergencies, 11th ed.." McGraw-Hill Education, New York. ISBN 978-1-25-985961-8.
First aid, Toxicology
National Institute for Occupational Safety and Health (NIOSH). 2023. "NIOSH Pocket Guide to Chemical Hazards (DHHS Publ. 2005-149)." U.S. Department of Health and Human Services / CDC, Cincinnati, OH. [↗]
First aid, PPE, Toxicology
European Committee for Standardization (CEN). 2016. "EN 374-1:2016 — Protective gloves against dangerous chemicals and micro-organisms." CEN, Brussels. [↗]
PPE
UNECE. 2023. "European Agreement Concerning the International Carriage of Dangerous Goods by Road (ADR 2025)." United Nations, Geneva. [↗]
Disposal, Regulations
National Fire Protection Association (NFPA). 2022. "NFPA 400 — Hazardous Materials Code." NFPA, Quincy, MA. [↗]
Storage
Urben, P.G. (ed.). 2017. "Bretherick's Handbook of Reactive Chemical Hazards, 8th ed.." Butterworth-Heinemann / Elsevier, Oxford. [↗]
Storage
Ministerstwo Klimatu i Środowiska RP. 2023. "Baza danych o produktach i opakowaniach oraz o gospodarce odpadami (BDO)." Ministerstwo Klimatu i Środowiska, Warszawa. National rules — Poland[↗]
Disposal
International Agency for Research on Cancer (IARC / WHO). 2024. "IARC Monographs on the Identification of Carcinogenic Hazards to Humans — List of Classifications." WHO, Lyon. [↗]
Toxicology
Tabs with their own references (Emergency, PPE, Storage, Waste) contain additional bibliographic entries within their respective sections.
Paste a series of replicate measurements (CSV, or one number per line). The calculator computes the mean, standard deviation and 95% CI, and detects outliers (Grubbs + Dixon Q).
Separator: comma, space, tab, new line. Minimum 3 measurements.
📐 Statistical formulas
x̄ = Σxᵢ / n — arithmetic mean
s² = Σ(xᵢ - x̄)² / (n-1) — sample variance
s = √s² — standard deviation
RSD% = (s / x̄) × 100% — relative standard deviation
Plan your entire laboratory project: add experiments with reagents, replicates, and duration. You'll get a Gantt chart, a shopping list (with links to the store!), a budget with a 10% margin, and a GHS risk matrix.
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🧪 Solubility and solvent compatibility
Molecule
Chlorine
Formula
Cl2
logP (XLogP3)
1.60
Mass (g/mol)
70.90
Polarity
Moderate
⚠️ GC estimate (Hoftyzer–Van Krevelen). No literature HSP data for this CAS — precision ±2 MPa½. Verify experimentally.
Solvent
Compat.
Ra
Visual
GC-MS
HPLC
Applications
References
Ra < R₀ = good miscibility · Ra < 1,5×R₀ = borderline · above = poor (R₀ — radius of the Hansen sphere of this molecule) For this molecule R₀ = 8..
Solubility theory (applied in compatibility prediction):
Yalkowsky, Samuel H., and Shri C. Valvani. 1980. "Solubility and Partitioning I: Solubility of Nonelectrolytes in Water." Journal of Pharmaceutical Sciences 69 (8): 912–922. https://doi.org/10.1002/jps.2600690814 — General Solubility Equation (GSE): logS = 0.5 − logP − 0.01(MP−25).
Hansen, Charles M. 2007. Hansen Solubility Parameters: A User's Handbook. 2nd ed. CRC Press. https://doi.org/10.1201/9781420006834 — HSP triplet (dD, dP, dH) + Ra formula.
Stefanis, E., and C. Panayiotou. 2008. "Prediction of Hansen Solubility Parameters with a New Group-Contribution Method." Int J Thermophys 29: 568–585. https://doi.org/10.1007/s10765-008-0415-z
Reichardt, Christian, and Thomas Welton. 2011. Solvents and Solvent Effects in Organic Chemistry. 4th ed. Wiley-VCH. https://doi.org/10.1002/9783527632220 — E_T(30) polarity scale, solvatochromism.
Snyder, Lloyd R., Joseph J. Kirkland, and John W. Dolan. 2010. Introduction to Modern Liquid Chromatography. 3rd ed. Wiley. https://doi.org/10.1002/9780470508183 — Eluotropic series, polarity index.
Van Krevelen, D. W., and K. Te Nijenhuis. 2009. Properties of Polymers. 4th ed. Elsevier. https://doi.org/10.1016/B978-0-08-054819-7.X0001-5 — Hoftyzer–Van Krevelen group contribution for dD/dP/dH from SMILES.
Marcus, Yizhak. 1998. The Properties of Solvents. Wiley Series in Solution Chemistry, Vol. 4. ISBN 9780471983699 — Complete tabular set of 250+ solvents (ε, μ, donicity, acceptor numbers).
PubChem Compound Database — CAS 7782-50-5 lookup ↗ — logP (XLogP3), water solubility experimental + predicted.
Full bibliography in the REFERENCES accordion (at the bottom of the page) — Chicago Manual of Style 17th ed., Author-Date.
🧮 Solubility calculator
Solubility:—
logS:—
Method:—
⚠️ —
Solubility vs temperature
🌐 Hansen Solubility Sphere (3D)
⚠️ The Hansen parameters for this substance fall outside the range of the method.
At least one of the δD/δP/δH parameters fell outside the domain of validity of the group contribution method (Hoftyzer–Van Krevelen), so the position of the molecule in Hansen space is unknown. The distance Ra is measured FROM THAT POINT — it cannot be calculated without knowing the point. The sphere and the distance table have been omitted rather than filled with numbers that have nothing behind them. Where a solubility measurement exists, it is shown in the table below.
Ra < R₀ = good miscibility · Ra < 1,5×R₀ = borderline · above = poor (R₀ — radius of the Hansen sphere of this molecule) Target molecule: δD=outside the method's range,
δP=outside the method's range,
δH=outside the method's range8
📊 Automatically extracted topics from the abstracts of 19 publications for CAS 7782-50-5.
Algorithm: TF-IDF (Salton & Buckley 1988) — term frequency × inverse document frequency.
sustainable 5
water 5
application 4
dioxide 4
seawater 4
aqueous 4
solution 4
here 4
surface 4
environmental 4
🔍 Ranking details (TF-IDF)
Tag
TF
DF
IDF
Score
sustainable
5
3
2.609
13.047
water
5
4
2.386
11.931
application
4
2
2.897
11.588
dioxide
4
2
2.897
11.588
seawater
4
3
2.609
10.438
aqueous
4
3
2.609
10.438
solution
4
3
2.609
10.438
here
4
4
2.386
9.545
surface
4
4
2.386
9.545
environmental
4
4
2.386
9.545
🔗 Citation network19 seed papers
📊 Citation graph for CAS 7782-50-5.
Each node = a research paper; an A→B edge = paper A cites B. Data from OpenAlex (Priem 2022).
⚡ Fetch network data
Network built on-demand from the OpenAlex API (24h cache).
Why this page can be checked
Identity
CAS, EC and molecular formula, resolved across the identifier systems a buyer uses. The count of systems resolved is shown, so you can see how well characterised this substance is rather than assuming.
Data
Every physicochemical value carries the source it came from and the date that source was read. Open any of them.
Classification
Read against the harmonised entry where one exists, with the index number stated. Self-classification is shown separately and labelled.
Regulatory
Inventory, restriction, authorisation and candidate-list status, each stated individually. Where a status is not established, this page says so — it never says no restrictions apply.
Documentation
Which documents exist, at what review level, in which languages, and when each was issued.
Supplier
Who is selling this, and what they have published about themselves.
Nothing on this page is a certification. It is a record you can audit.
Two guarantees, both with their limits stated
The Gap Report Guarantee
If the available evidence cannot support a defensible document for your CAS number and product specification, we will not invent the missing values. You receive a documented gap report and choose: a refund, store credit, or the report on its own.
A visible gap is worth more than a plausible number, because the plausible number is the one that fails when somebody checks it.
The Re-issue Promise
If a signed card is rejected by an authority or by a customer’s compliance officer on one of the points we checked and reported as passed, we re-issue it corrected at no charge and credit the original fee.
This covers the checks we performed and named. It does not cover registration status, tonnage, or your role in the supply chain — those are not ours to hold, and a guarantee that pretended otherwise would be worth nothing.
Documentation for chlorine, CAS 7782-50-5, prepared to the structure European enforcement expects. What is sold here is paperwork; the substance itself is not offered.
chlorine (CAS 7782-50-5) at a glance
Substance – chlorine
CAS number – 7782-50-5
EC number – 231-959-5
CLP Annex VI index number – 017-001-00-7
Hazard statements – H270; H331 (toxic if inhaled); H335 (may cause respiratory irritation); H315 (causes skin irritation); H319 (causes serious eye irritation); H400 (very toxic to aquatic life)
CMR classification – not classified as CMR in the harmonised entry
Documentation issued – safety data sheet in REACH Annex II structure; working draft or signed card
What is supplied – a document. MolGod.org does not sell, supply or ship chemical substances.
Which GHS pictograms apply to chlorine?
The label for chlorine carries GHS03 (flame over circle), GHS04 (gas cylinder), GHS06 (skull and crossbones), GHS09 (environment), with the signal word Danger. These are not chosen by the supplier: CLP Annex VI states them for CAS 7782-50-5, and the precedence rules in Annex I decide which pictogram is dropped when two would say the same thing. A label showing a different set from the register is wrong even if every hazard statement on it is correct.
What is the UN number for chlorine?
For carriage, chlorine is assigned UN 1017, transport class 2.3, with subsidiary risk 5.1+8. These entries belong in section 14 of the safety data sheet and must match the shipping papers exactly. A consignment where the sheet and the transport document disagree on the UN number is stopped before anyone reads the remaining fifteen sections.
Where is regulatory status recorded for chlorine?
The regulatory status of chlorine evolves separately from its hazard classification. A substance may maintain consistent hazard characteristics over extended periods while gaining additional obligations under Section 15, leading to this section becoming outdated more rapidly than Section 2.
What do customs check when importing chlorine?
When a consignment of chlorine is stopped at the border, the document examined first is rarely the invoice. It is section 14 of the safety data sheet and its agreement with the transport papers. A missing packing group, an absent UN number or a proper shipping name that contradicts the classification of CAS 7782-50-5 will hold the pallet regardless of how complete the remaining fifteen sections are.
What is the CLP classification of chlorine?
The harmonised classification for CAS 7782-50-5 carries 6 hazard statements: H270, H331, H335, H315, H319, H400. In plain terms this means H270; toxic if inhaled; may cause respiratory irritation; causes skin irritation. A harmonised entry is binding across the Union — an importer may not soften it, and a self-classification that diverges from it will not survive an enforcement check.
Can I import chlorine into the EU?
An import of CAS 7782-50-5 succeeds or fails on whether the accompanying sheet matches the register. Among substances listed in CLP Annex VI the recurring failure is a classification carried over from a supplier outside the Union, where the same substance may be classified differently. Index 017-001-00-7 is the binding reference, and it is in regulated consignments that the discrepancy surfaces.
What Annex VI notes and concentration limits apply to chlorine?
The Annex VI entry for CAS 7782-50-5 carries note U. Notes are not commentary: they modify how the classification applies — to concentration ranges, to specific forms of the substance, or to the labelling that follows from it. An entry read without its notes is read incompletely. The register also records M = 100 for this entry. Specific concentration limits, M-factors and acute toxicity estimates override the generic cut-off values, so a mixture calculation that ignores them will classify the mixture wrongly in both directions.
How is chlorine classified for road, sea and air transport?
The transport classification for chlorine falls under section 14 and varies depending on the mode of transport: ADR for road, IMDG for sea, and IATA for air. A document that prints all three classifications without specifying which one applies places the responsibility on the shipper to select the correct one, and it is the shipper who faces penalties for making an incorrect choice.
Documentation demand on the EU market
CAS 7782-50-5 has a recorded presence on the European trading market, which means documentation for it is requested routinely rather than exceptionally. Substances that move in commerce attract repeat scrutiny: the same sheet is read by successive customers, carriers and authorities, and a defect that survives the first reading rarely survives the tenth.
What must the label for chlorine contain?
The supply label for chlorine is generated from the same classification that drives the safety data sheet: pictograms selected by precedence, one signal word derived from the highest hazard class present, and the hazard statements H270, H331, H335… reproduced in full. Where the container is too small to carry the complete set at a legible size, there are lawful ways to handle it and unlawful ones that look identical to a non-specialist.
What concentration limits apply to chlorine?
M-factor on record: 100. The M-factor multiplies the contribution of this substance in the aquatic hazard calculation for a mixture, which is where it is most often overlooked.
What is the EC number for chlorine?
Alongside CAS 7782-50-5, this substance carries EC number 231-959-5 and Annex VI index 017-001-00-7. European documentation is built around the EC number as often as around the CAS: registration dossiers, the candidate list and customs systems key on it. A safety data sheet quoting only one of the two forces every downstream reader to look up the other.
Identifiers that must agree
CAS 7782-50-5 and index number 017-001-00-7 are not interchangeable and not decorative. The index number ties the entry to the harmonised classification; the CAS number ties it to the chemical literature. A file carrying one without the other forces every reader to reconstruct the link, and reconstruction is where errors enter.
Which SDS sections decide whether a shipment clears?
The sixteen sections outlined in Annex II are not merely a formatting requirement; each section has a specific purpose, and inspectors review them by number. For the CAS registry number 7782-50-5, the sections typically determining acceptance are 2 (classification against the harmonised entry), 3 (composition and identifiers), 14 (transport) and 15 (regulatory status). It is imperative not to merge, renumber or omit any sections, as placeholders must remain unchanged.
Purity, certificates and what the sheet does not say
Purity grade is a certificate question, not a safety data sheet question. The sheet for chlorine describes the substance; a certificate of analysis describes one batch of it, with the measured result against the specification and the analytical method named per parameter. Laboratories asking for ‘the COA’ usually need both documents.
Questions about documentation for chlorine
What is the CAS number of chlorine?
CAS 7782-50-5. In CLP Annex VI the same substance carries index number 017-001-00-7, and both identifiers should appear in the documentation.
What hazard statements apply to CAS 7782-50-5?
The harmonised entry lists H270, H331, H335, H315. These are binding across the Union and may not be softened by a self-classification.
In which language must the sheet be supplied?
In an official language of each Member State where chlorine is placed on the market, unless that State has stated otherwise.
Can I check whether my existing sheet is still valid?
Yes. A section-by-section reading against Annex II and the current harmonised entry establishes that in one pass, and a sheet that passes is reported as passing.
MolGod.org issues documentation and does not sell, supply or ship chemical substances. CAS 7782-50-5 identifies the subject of this document.
Which version do you need?
📄
SDS Working Draft
€49.99
Delivered automatically after payment, by e-mail
Full 16-section REACH Annex II structure
Classification against ECHA CLP Annex VI
Public-source data with references
Unresolved gaps flagged, never filled by guesswork
For internal drafting and supplier review. Unsigned; supplier-specific fields may need completing.
Best for
Seeing what the document will contain before you commit
Comparing what a supplier sent you against the register
Finding the gaps in a sheet you already hold
Preparing an internal file before an export decision
Substances you handle but do not yet sell
Recommended when the document leaves your company✍
Expert-Reviewed SDS
€249.99
Everything in the Working Draft
Reviewed by a competent person under Annex II, section by section
Adapted to your company, product grade and identified use
Destination market and language checked
Transport section reviewed for the mode you request
Five rounds of corrections applied to your instructions
Within 72 hours of receiving complete input.
Best for
Any document that leaves your company
A customer or distributor who asked for the sheet
Paperwork travelling with an export shipment
A sheet an inspector or authority may read
Replacing a sheet a customer has already rejected
If you are unsure, read down the left column and stop at the first line that describes your situation.
What the document is for
Working Draft €49.99
Expert-Reviewed €249.99
Internal drafting and review
Yes
Yes
Checking a sheet a supplier sent you
Yes
Yes
Sent to your customer
Not written for this
Yes
Travels with an export shipment
Not written for this
Yes
Read by an inspector or authority
Not written for this
Yes
Adapted to your company, grade and identified use
No
Yes
Signed and dated by the reviewer
No
Yes
When you get it
Immediately after payment
Within 72 hours of complete input
Nothing stops you sending a draft to anyone. "Not written for this" means exactly that: it carries no signature and no fields adapted to your company, so it will not answer the questions the recipient is about to ask.
What the signature means
Who prepares the document
The document is generated by the MolGod engine from ECHA CLP Annex VI and the cited public sources, then read section by section by a qualified scientific reviewer with a degree in chemistry or a related scientific field.
What the review covers
The sheet is read section by section against the REACH Annex II structure. GHS classification and transport entries are checked against the sources cited in the document, and the sheet is adapted to the company, product grade and identified use you provide.
What is NOT verified
We do not test your material and we cannot confirm what is physically in your container: composition, concentration, impurities or manufacturing route. Those come from you and are reproduced as supplied.
What the signature is — and is not
The signature records that a qualified scientific reviewer read the document. It is not a government approval, not an ECHA approval, and not a legal certification — no such certification exists for safety data sheets in the EU. A signature does not by itself make a document legally valid or make your business compliant.
What you receive
A PDF in the 16-section REACH Annex II structure, signed and dated, with version information and a list of anything we could not establish. Five rounds of corrections are included.
Delivery
Within 72 hours of receiving complete input from you. The clock pauses whenever we are waiting on an answer.
Refunds
Full refund before review begins. If the evidence is insufficient, you choose a refund, store credit or a gap report. See the refund policy.
No fabricated-data guarantee.
If the available evidence is insufficient to support a defensible document for this CAS number and your product specification, we will not invent the missing values. You may choose a refund, store credit or a documented gap report.
The supplier placing the substance or mixture on the market remains responsible for ensuring that the final safety data sheet matches the material, its identified uses and their legal role in the supply chain.
📚 Scientific references (Chicago Author-Date) — click to expand
Batch management and laboratory certification standards — 13 independent sources (ICH Q1/Q3/Q6/Q7/Q10 + ISO 17025 + WHO TRS + 21 CFR 211 + EMA + USP + Ph.Eur. + PIC/S + IPEC-PQG).
International Council for Harmonisation (ICH). 2000. "Q7 Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients." ICH Expert Working Group. [link ↗] — GMP for APIs — adopted by EMA, FDA, MHLW
International Organization for Standardization. 2017. "ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories." ISO. [link ↗] — Lab accreditation standard underpinning every CoA
World Health Organization. 2010. "WHO Good Manufacturing Practices for Pharmaceutical Products: Main Principles (WHO Technical Report Series No. 957, Annex 3)." WHO Press. [link ↗] — WHO TRS No. 957 — global reference for GMP
International Council for Harmonisation (ICH). 2003. "ICH Q1A(R2): Stability Testing of New Drug Substances and Products." International Council for Harmonisation. [link ↗] — Source for batch shelf-life and retest dating
International Council for Harmonisation (ICH). 2006. "ICH Q3A(R2): Impurities in New Drug Substances." ICH. [link ↗]
International Council for Harmonisation (ICH). 1999. "ICH Q6A: Specifications for New Drug Substances and Products." ICH. [link ↗] — CoA acceptance-criteria specification standard
International Council for Harmonisation (ICH). 2008. "ICH Q10: Pharmaceutical Quality System." ICH. [link ↗]
U.S. Food and Drug Administration. 2024. "21 CFR Part 211: Current Good Manufacturing Practice for Finished Pharmaceuticals." US Code of Federal Regulations. [link ↗] — US legal mandate (Subpart J — Records and Reports)
European Medicines Agency. 2014. "Guideline on Process Validation for Finished Products — Information and Data to Be Provided EMA/CHMP/CVMP/QWP/BWP/70278/2012." European Medicines Agency. [link ↗]
United States Pharmacopeial Convention. 2024. "United States Pharmacopeia and National Formulary, USP 47-NF 42." USP. [link ↗]
European Pharmacopoeia Commission. 2024. "European Pharmacopoeia 11th Edition." Council of Europe — EDQM. [link ↗]
Pharmaceutical Inspection Co-operation Scheme (PIC/S). 2021. "Guide to Good Manufacturing Practice for Medicinal Products PE 009-15." PIC/S Secretariat, Geneva. [link ↗] — Cross-recognized GMP for 54 inspectorates worldwide
International Pharmaceutical Excipients Council (IPEC) and Pharmaceutical Quality Group (PQG). 2017. "Joint IPEC-PQG Good Manufacturing Practices Guide for Pharmaceutical Excipients." IPEC-Americas. [link ↗] — Excipient-grade CoA standard for non-API ingredients
📜 Patents (public metadata)
no data
No public patent metadata was found for this substance in Crossref / OpenAlex at this time. Data will be updated automatically after the next cache refresh (24h).
📚 References (Chicago Author-Date) — click to expand
(2026). "Which halogen to choose? Comparing the effects of chlorine and fluorine as bioisosteric substituents in drug design.". https://doi.org/10.1039/d5sc07348k
et al.. (2026). "Multisite atomic-chlorine-passivation stabilizes perovskite interfaces for efficient H2O2 photosynthesis from seawater.". https://doi.org/10.1038/s41467-026-70503-2
et al.. (2026). "Chlorine radical-mediated electrochemical propylene epoxidation from seawater.". https://doi.org/10.1038/s41467-026-70733-4
et al.. (2026). "Planar hexacoordinate chlorine.". https://doi.org/10.1039/d5sc09167e
et al.. (2026). "A Dual GC-MS and LC-MS/MS Analytical Strategy for Evaluating Free Chlorine Toxicity in Aqueous Samples.". https://doi.org/10.1002/rcm.70151
et al.. (2026). "Novel Smartphone Paper Sensor for One Health: Monitoring Free Chlorine in Water and Exhaled Breath Condensate.". https://doi.org/10.3390/s26103066
et al.. (2026). "A chlorine releasing solution as an alternative for dental biofilm control.". https://doi.org/10.1038/s41598-026-49642-5
et al.. (2026). "Advanced Chlorine Photolysis for Carbamazepine Degradation: Tuning Radicals for Dissolved Organics.". https://doi.org/10.1021/acsestwater.5c01498
(2026). "Surface morphology modulation in chlorine-doped diisopropylammonium bromide film via Cl-induced domain refinement.". https://doi.org/10.1016/j.isci.2026.116245
et al.. (2026). "Compressed Co-O Bonds Resist Chlorine Corrosion to Enhance the Stability of Chlorine-Involved Anodic Reactions.". https://doi.org/10.1002/anie.202519520
et al.. (2026). "Effects of Foliar Application of Iron Chlorine e6 on the Starch Physicochemical Properties and In Vitro Digestibility of Waxy Maize.". https://doi.org/10.1002/fsn3.71978
et al.. (2026). "Controlled release of chlorine dioxide from α-cyclodextrin complexes embedded in poly(lactic acid)/poly(butylene adipate-co-butylene terephthalate) films for sustainable food packaging.". https://doi.org/10.1016/j.fochx.2026.103982
Kuanchang He, Wei Li, Jinxing Ma et al.. (2026). "Strain-induced faceting of Ti4O7 for active chlorine electrosynthesis". Nature Communications. https://doi.org/10.1038/s41467-026-75687-1
Isni Arliyani, Hilmi Iqlima Khoirunnisa, Heri Septya Kusuma et al.. (2026). "Impact of chlorine dioxide (ClO2) on reverse osmosis (RO) membrane integrity: degradation behavior, surface property changes, and implications for biofouling control". RSC Advances. https://doi.org/10.1039/d5ra09010e
et al.. (2026). "Electrosynthesis of Chlorine Oxidant From Direct Seawater Electrolysis via High-Entropy Intermetallic.". https://doi.org/10.1002/asia.70864
et al.. (2025). "Sustainable chlorine cycle enabled by single atom catalysis.". https://doi.org/10.1038/s41467-025-65505-5
et al.. (2025). "Colorimetric detection of chloroperoxyl radical in reactive chlorine species solutions.". https://doi.org/10.1371/journal.pone.0334046
et al.. (2025). "The Engineered Synthesis and Enhancement of Nitrogen and Chlorine Co-Doped Fluorescent Carbon Dots for the Sensitive Detection of Quercetin.". https://doi.org/10.3390/ma18112669
World Intellectual Property Organization. 2024. "Patent Cooperation Treaty (PCT)." https://www.wipo.int/pct/.
U.S. Patent and Trademark Office. 2024. "USPTO Patent Public Search." https://ppubs.uspto.gov/.
European Patent Office. 2024. "Espacenet Patent Search." https://worldwide.espacenet.com/.
Newman, David J., and Gordon M. Cragg. 2020. "Natural Products as Sources of New Drugs over the Nearly Four Decades from 01/1981 to 09/2019." Journal of Natural Products 83 (3): 770-803.
Davies, Mark, Michał Nowotka, George Papadatos, et al. 2015. "ChEMBL Web Services: Streamlining Access to Drug Discovery Data and Utilities." Nucleic Acids Research 43 (W1): W612-W620.
Bickerton, G. Richard, Gaia V. Paolini, Jérémy Besnard, Sorel Muresan, and Andrew L. Hopkins. 2012. "Quantifying the Chemical Beauty of Drugs." Nature Chemistry 4 (2): 90-98.
Meanwell, Nicholas A. 2011. "Synopsis of Some Recent Tactical Application of Bioisosteres in Drug Design." Journal of Medicinal Chemistry 54 (8): 2529-2591.
Ertl, Peter, and Ansgar Schuffenhauer. 2009. "Estimation of Synthetic Accessibility Score of Drug-Like Molecules Based on Molecular Complexity and Fragment Contributions." Journal of Cheminformatics 1: 8.
Hopkins, Andrew L., and Colin R. Groom. 2002. "The Druggable Genome." Nature Reviews Drug Discovery 1 (9): 727-730.
Allison, John R., and Mark A. Lemley. 1998. "Empirical Evidence on the Validity of Litigated Patents." AIPLA Quarterly Journal 26 (3): 185-275.
Patani, George A., and Edmond J. LaVoie. 1996. "Bioisosterism: A Rational Approach in Drug Design." Chemical Reviews 96 (8): 3147-3176.
Lerner, Josh. 1994. "The Importance of Patent Scope: An Empirical Analysis." RAND Journal of Economics 25 (2): 319-333.
Crystallographic data for 7782-50-5 verified against COD (0 diffraction peaks). The 2θ values below allow identification of the polymorphic form by PXRD in the laboratory.
International Centre for Diffraction Data. 2024. PDF-4+ 2024. Newtown Square, PA: ICDD. 🔓
Allen, Frank H. 2002. "The Cambridge Structural Database: a quarter of a million crystal structures and rising." Acta Crystallographica B 58 (3): 380–388. https://doi.org/10.1107/S0108768102003890
Grazulis, Saulius, Adriana Merkys, Antanas Vaitkus, and Daniel Chateigner. 2012. "Computing stoichiometric molecular composition from crystal structures." Journal of Applied Crystallography 45 (6): 1241–1248. https://doi.org/10.1107/S0021889812042185Open Access
Cullity, B. D., and Stuart R. Stock. 2001. Elements of X-Ray Diffraction. 3rd ed. Upper Saddle River, NJ: Prentice Hall.
Jenkins, Ron, and Robert L. Snyder. 1996. Introduction to X-Ray Powder Diffractometry. New York: Wiley-Interscience. https://doi.org/10.1002/9781118520949
Giacovazzo, Carmelo, Hugo L. Monaco, Giuseppe Artioli, Davide Viterbo, Marco Milanesio, Gastone Gilli, Paola Gilli, Giuseppe Zanotti, Giampiero Ferraris, and Mario Catti. 2011. Fundamentals of Crystallography. 3rd ed. Oxford: Oxford University Press.
Dinnebier, Robert E., and Simon J. L. Billinge, eds. 2008. Powder Diffraction: Theory and Practice. Cambridge: Royal Society of Chemistry. https://doi.org/10.1039/9781847558237
United States Pharmacopeia. 2024. "Chapter <941> Characterization of Crystalline and Partially Crystalline Solids by X-Ray Powder Diffraction (XRPD)." USP-NF. Rockville, MD: USP. 🔓
FAQ — frequently asked questions about PXRD
What is d-spacing and how is it interpreted?
d-spacing is the distance between parallel lattice planes of a crystal, expressed in angstroms (Å). The larger the d, the smaller the 2θ angle. Peaks with a large d (low 2θ) identify long-period structures; peaks at high 2θ — closely packed planes. d-spacing is a structural constant — it does not depend on the instrument.
What is Rietveld refinement and when is it used?
Rietveld refinement (Hugo Rietveld, 1969) is a method of fitting the whole PXRD pattern to a structural model by least squares. It makes it possible to determine lattice parameters, atomic positions and the percentage phase composition of a mixture. It is used when you need more than identification — for example to quantify polymorphs or to refine a structure from powder data.
What does I/I₀ (relative intensity) mean?
I/I₀ is the intensity of a peak expressed as a percentage of the intensity of the strongest peak (I₀=100). Intensity depends on the number of atoms in the plane, their type (atomic factor) and thermal scattering. For identifying a polymorphic form it is the SET of peaks that matters — not individual values.
What is the Cambridge Structural Database (CSD)?
The CSD (Cambridge Structural Database) is a commercial CCDC database with 1.3 million organic and metal-organic structures — the gold standard of crystallography. Every structure has a unique refcode (e.g. ACSALA01 = aspirin Form I). Access requires a licence (~USD 5,775/year academic). WebCSD (searching individual structures) and Mercury (visualisation) are free.
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📚 REFERENCES (Aggregate bibliography, Chicago Author-Date) 78 items
All scientific sources cited in the accordions above for CAS 7782-50-5. Format: Chicago Manual of Style 17th ed., Author-Date system.
AIST. n.d. Spectral Database for Organic Compounds (SDBS): CAS 7782-50-5. Tsukuba, Japan: National Institute of Advanced Industrial Science and Technology. https://sdbs.db.aist.go.jp/.
Linstrom, Peter J., and William G. Mallard, eds. n.d. NIST Chemistry WebBook: NIST Standard Reference Database Number 69. Gaithersburg, MD: National Institute of Standards and Technology. https://doi.org/10.18434/T4D303.
PubChem. n.d. PubChem Compound Summary: CAS 7782-50-5. Bethesda, MD: National Center for Biotechnology Information (NCBI), National Library of Medicine. https://pubchem.ncbi.nlm.nih.gov/#query=7782-50-5.
European Chemicals Agency (ECHA). 2024. "Annex VI to Regulation (EC) No 1272/2008 (CLP) — Harmonised Classification and Labelling." ECHA, Helsinki / Official Journal of the European Union. https://echa.europa.eu/regulations/clp/clp-classification.
National Institute for Occupational Safety and Health (NIOSH). 2017. "Recommendations for Chemical Protective Clothing: A Companion to the NIOSH Pocket Guide." U.S. Department of Health & Human Services / CDC. https://www.cdc.gov/niosh/ncpc/default.html.
Connors, Kenneth A., Gordon L. Amidon, and Valentino J. Stella. 1986. Chemical Stability of Pharmaceuticals: A Handbook for Pharmacists, 2nd ed.. New York: Wiley. https://doi.org/10.1002/0471734683.
Rumble, John R., ed. 2019. CRC Handbook of Chemistry and Physics: 100th Edition. Boca Raton, FL: CRC Press. https://hbcp.chemnetbase.com/.
Stefanis, Emmanuel, and Costas Panayiotou. 2008. "Prediction of Hansen Solubility Parameters with a New Group-Contribution Method." International Journal of Thermophysics 29: 568-585. https://doi.org/10.1007/s10765-008-0415-z.
Stoll, Vincent S., and John S. Blanchard. 1990. "Buffers: Principles and Practice: In Methods in Enzymology, vol. 182." San Diego: Academic Press. https://doi.org/10.1016/0076-6879(90)82008-P.
European Parliament. 2008. "Regulation (EC) No 1272/2008 on Classification, Labelling and Packaging of Substances and Mixtures (CLP)." Official Journal of the European Union L 353: 1–1355.
United Nations. 2021. Globally Harmonized System of Classification and Labelling of Chemicals (GHS). 9th revised ed. ST/SG/AC.10/30/Rev.9. New York and Geneva: United Nations. https://unece.org/ghs-rev9-2021.
United States Pharmacopeial Convention. 2024. "USP <621> Chromatography." In United States Pharmacopeia and National Formulary, USP 47-NF 42. Rockville, MD: USP. https://www.uspnf.com/.
International Organization for Standardization. 2017. "ISO/IEC 17025:2017 General Requirements for the Competence of Testing and Calibration Laboratories." Geneva: ISO. https://www.iso.org/standard/66912.html.
Kolthoff, Izaak Maurits, and Philip J. Elving, eds. 1978. Treatise on Analytical Chemistry, Part I: Theory and Practice. 2nd ed. New York: Wiley-Interscience.
Skoog, Douglas A., F. James Holler, and Stanley R. Crouch. 2018. Principles of Instrumental Analysis. 7th ed. Boston: Cengage Learning.
Christian, Gary D., Purnendu K. Dasgupta, and Kevin A. Schug. 2014. Analytical Chemistry. 7th ed. Hoboken, NJ: Wiley.
International Organization for Standardization. 1994. "ISO 5725-2:1994 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method." Geneva: ISO. https://www.iso.org/standard/11834.html.
Heckert, N. A., and J. J. Filliben. 2003. "NIST/SEMATECH e-Handbook of Statistical Methods." NIST Handbook 151. Gaithersburg, MD: National Institute of Standards and Technology. https://www.itl.nist.gov/div898/handbook/.
Grubbs, Frank E. 1950. "Sample Criteria for Testing Outlying Observations." Annals of Mathematical Statistics 21 (1): 27–58.
Dixon, Wilfrid J. 1950. "Analysis of Extreme Values." Annals of Mathematical Statistics 21 (4): 488–506.
Snedecor, George W., and William G. Cochran. 1989. Statistical Methods. 8th ed. Ames, IA: Iowa State University Press.
Student [William Sealy Gosset]. 1908. "The Probable Error of a Mean." Biometrika 6 (1): 1–25.
International Organization for Standardization. 2005. "ISO 3534-1:2006 Statistics — Vocabulary and Symbols — Part 1: General Statistical Terms and Terms Used in Probability." Geneva: ISO. https://www.iso.org/standard/40145.html.
Thompson, Michael, Stephen L. R. Ellison, and Roger Wood. 2002. "Harmonized Guidelines for Single-Laboratory Validation of Methods of Analysis." Pure and Applied Chemistry 74 (5): 835–855.
United Nations Economic Commission for Europe. 2024. European Agreement Concerning the International Carriage of Dangerous Goods by Road (ADR), Applicable as from 1 January 2025 (ECE/TRANS/352). Geneva: UNECE. https://unece.org/transport/dangerous-goods/adr-2025-edition.
Ministerstwo Klimatu i Środowiska Rzeczypospolitej Polskiej. 2020. "Rozporządzenie Ministra Klimatu z dnia 2 stycznia 2020 r. w sprawie katalogu odpadów." Dziennik Ustaw RP 2020 poz. 10. https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20200000010. National rules — Poland
Główny Inspektorat Ochrony Środowiska (GIOŚ). 2024. "Baza Danych O Odpadach (BDO) — System rejestracji firm utylizacyjnych." Ministerstwo Klimatu i Środowiska. https://bdo.mos.gov.pl/. National rules — Poland
International Organization for Standardization. 2017. "ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories." ISO. https://www.iso.org/standard/66912.html.
World Health Organization. 2010. "WHO Good Manufacturing Practices for Pharmaceutical Products: Main Principles (WHO Technical Report Series No. 957, Annex 3)." WHO Press. https://www.who.int/publications/m/item/trs957-annex3.
Pharmaceutical Inspection Co-operation Scheme (PIC/S). 2021. "Guide to Good Manufacturing Practice for Medicinal Products PE 009-15." PIC/S Secretariat, Geneva. https://picscheme.org/en/publications.
📜 License & provenancePREDICTED MODEL · NOT VERIFIED
PREDICTED MODEL — NOT VERIFIED computed by MolGod Scientific · experimental feature (beta) · may contain errors
No source 3-D conformer was available to MolGod for this substance. MolGod Scientific computed this geometry from the structural formula with RDKit 2026.03.6 (ETKDGv3 conformer generation, MMFF94 force-field optimisation; lowest-energy converged conformer of a fixed-seed set). It is not a measured structure, it does not come from PubChem, and it has not been compared with experimental data. It shows one possible conformation.
Methods and references
RDKit: Open-source cheminformatics, version 2026.03.6. Zenodo. doi:10.5281/zenodo.22140358 (all versions: doi:10.5281/zenodo.591637)
Riniker S, Landrum GA. Better Informed Distance Geometry: Using What We Know To Improve Conformation Generation. J. Chem. Inf. Model. 2015, 55, 2562-2574. doi:10.1021/acs.jcim.5b00654
Wang S, Witek J, Landrum GA, Riniker S. Improving Conformer Generation for Small Rings and Macrocycles Based on Distance Geometry and Experimental Torsional-Angle Preferences. J. Chem. Inf. Model. 2020, 60, 2044-2058. doi:10.1021/acs.jcim.0c00025
Halgren TA. Merck molecular force field. I. Basis, form, scope, parameterization, and performance of MMFF94. J. Comput. Chem. 1996, 17, 490-519. doi:10.1002/(SICI)1096-987X(199604)17:5/6<490::AID-JCC1>3.0.CO;2-P
Tosco P, Stiefl N, Landrum G. Bringing the MMFF force field to the RDKit: implementation and validation. J. Cheminform. 2014, 6, 37. doi:10.1186/s13321-014-0037-3
Heller SR, McNaught A, Pletnev I, Stein S, Tchekhovskoi D. InChI, the IUPAC International Chemical Identifier. J. Cheminform. 2015, 7, 23. doi:10.1186/s13321-015-0068-4
