# Calcium hypochlorite CAS: 7778-54-3 PubChem CID: 24504 InChIKey: ZKQDCIXGCQPQNV-UHFFFAOYSA-N Wikidata: Q407300 Molecular formula: CaCl₂O₂ Molar mass: 142.98 g/mol IUPAC: calcium dihypochlorite SMILES: [O-]Cl.[O-]Cl.[Ca+2] InChI: InChI=1S/Ca.2ClO/c;2*1-2/q+2;2*-1 PSA: 46.1 A^2 Hydrogen bond donors: 0 Hydrogen bond acceptors: 2 Rotatable bonds: 0 Heavy atoms: 5 3D structure: 5 atoms, 2 bonds ## About the compound Calcium hypochlorite is a chemical compound registered under CAS number 7778-54-3. Molecular formula: CaCl₂O₂. Molar mass: 142.98 g/mol. The full systematic IUPAC name is: calcium dihypochlorite. The molecule contains 5 atoms connected by 2 chemical bonds. Chemical data comes from the PubChem (NIH), ChEMBL (EBI) and NIST WebBook databases. GHS statement translations comply with the CLP Regulation (EC 1272/2008). Interactive 3D model and 2D skeleton available at: https://molgod.org/molecule/7778-54-3/ ## GHS classification Signal word: Danger Pictograms: GHS03, GHS05, GHS07, GHS09 Classification status: Harmonised classification pursuant to Annex VI of the CLP Regulation (EC) 1272/2008 (official, binding classification). Index number: 017-012-00-7. Reference (Chicago): European Chemicals Agency. "calcium hypochlorite, Index No. 017-012-00-7." 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. Hazard statements (H): H272: May intensify fire; oxidiser H302: Harmful if swallowed H314: Causes severe skin burns and eye damage H400: Very toxic to aquatic life EUH031: Contact with acids liberates toxic gas. Precautionary statements (P): P210: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking P220: Keep away from clothing and other combustible materials P260: Do not breathe dust/fume/gas/mist/vapours/spray P264: Wash thoroughly after handling P270: Do not eat, drink or smoke when using this product P273: Avoid release to the environment P280: Wear protective gloves/protective clothing/eye protection/face protection P301+P312: IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell P301+P330+P331: IF SWALLOWED: Rinse mouth; Do NOT induce vomiting P303+P361+P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing; Rinse skin with water or shower P304+P340: IF INHALED: Remove person to fresh air and keep comfortable for breathing P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes; Remove contact lenses, if present and easy to do. Continue rinsing P310: Immediately call a POISON CENTER or doctor/physician P321: Specific treatment P330: Rinse mouth P363: Wash contaminated clothing before reuse P370+P378: In case of fire: Use appropriate media to extinguish P391: Collect spillage P405: Store locked up P501: Dispose of contents/container to an approved waste collection point ## Toxicology (LD50) LD50 (dermal): LD50 >2000 mg/kg (rabbit) ## Synonyms - CALCIUM HYPOCHLORITE - 7778-54-3 - Calcium hypochloride - Hypochlorous acid, calcium salt - Bleaching powder - Pittchlor - Pittcide - Pittclor - Chemichlor G - Chlorine of lime - Solvox KS - T-Eusol ## Regulatory compliance checklist 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). 3 required / 12 items [fulfilled] SDS (Safety Data Sheet) available (sds) How to comply: Requirement: current SDS compliant with Reg. 1907/2006 (REACH) Annex II, 16-section format. Source / form: https://echa.europa.eu/information-on-chemicals [required] Compliant CLP label (pictograms + signal word + H/P) (clp_label) 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. CLP VI: Ox. Sol. 2, Acute Tox. 4 *, Skin Corr. 1B, Aquatic Acute 1 — H272, H302, H314, H400, EUH031 Source / form: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32008R1272 [required] Chemical OSH training (substance-specific) (bhp_training) How to comply: Laboratory staff: initial training (general induction + job-specific) + refresher training every 5 years (or every 3 for engineering/technical positions). Documentation kept in personnel files. Source / form: https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20040180169 [required] BDO registration (Polish Waste Database) (bdo_registration) How to comply: The GHS classification of this substance indicates properties that may render the waste arising from it hazardous (Regulation 1357/2014, HP properties — with concentration thresholds calculated from the content in the waste, not in the reagent). Whether this gives rise to an obligation to keep BDO records depends on the waste producer and the scale of activity (Art. 50 of the Polish Waste Act; exemptions include up to 100 kg/year of hazardous waste). This is not a statement of obligation for the purchaser. Source / form: https://bdo.mos.gov.pl/ [to be verified] ADR transport (international agreement) (adr_transport) How to comply: No ADR data in the MOL-GOD dataset for this CAS number. Do NOT assume there are no restrictions — before shipping, verify the transport classification in ADR 2025 (Table A) and in section 14 of the safety data sheet (SDS). Source / form: https://unece.org/transport/dangerous-goods/adr-2025-files [conditional] REACH registration (>1 t/year EU import) (reach_registration) 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. Source / form: https://echa.europa.eu/regulations/reach/registration [to be verified] SVHC notification (Substances of Very High Concern) (svhc_declaration) How to comply: SVHC status not verified against the available dataset — check the current ECHA candidate list; do not assume the absence of an entry. Source / form: https://echa.europa.eu/candidate-list-table [to be verified] REACH Annex XIV (authorisation list) (reach_annex_xiv) How to comply: Not verified against the ECHA Authorisation List — check REACH Annex XIV. Source / form: https://echa.europa.eu/authorisation-list [not applicable] REACH Annex XVII (use/marketing restrictions) (reach_annex_xvii) 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. Source / form: https://echa.europa.eu/substances-restricted-under-reach [to be verified] OEL — Occupational Exposure Limit in the working environment (nds_workplace) How to comply: No NDS data in the MOL-GOD dataset (incomplete set — ~41 of ~600 substances in the list). Absence does NOT mean there is no NDS — check the full list in Dz.U. 2024 poz. 1017 (Regulation of the Ministry of Family and Social Policy of 4 September 2024), and where none exists apply the OEL from EU directives or values recommended by NIOSH/ACGIH. Source / form: https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20240001017 [to be verified] GIS register (precursors / psychotropics) (gis_register) How to comply: Does not appear in the available working set of precursors (list incomplete). Absence is NOT a confirmation — verify against Annex I of Reg. (EC) 273/2004 and the GIS list before placing on the market. Source / form: https://www.gov.pl/web/gis [fulfilled] Safety Data Sheet in Polish (sds_pl) How to comply: Requirement: SDS in Polish for trade in PL (Art. 31 REACH + Chemical Substances Act Art. 17). Source / form: https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20012112135 ## Data sources - PubChem CID 24504: https://pubchem.ncbi.nlm.nih.gov/compound/24504 - NIST WebBook: https://webbook.nist.gov/cgi/cbook.cgi?ID=7778-54-3 - ChEMBL: https://www.ebi.ac.uk/chembl/g/#search_results/all/query=7778-54-3 --- Standalone HTML page: https://molgod.org/molecule/7778-54-3/ Canonical: https://molgod.org/molecule/7778-54-3/ Markdown version: https://molgod.org/molecule/7778-54-3.md JSON API: https://molgod.org/wp-json/molgod/v1/molecule/7778-54-3 Last updated: 2026-09-03 Licence: Chemical facts in this record come from the public sources credited above; MolGod.org claims no rights in them. The selection, arrangement and texts of this record are © MolGod.org, all rights reserved. Details: https://molgod.org/copyright/#data How to cite: MolGod.org. "Calcium hypochlorite (CAS 7778-54-3)." Last modified 2026-09-03. https://molgod.org/molecule/7778-54-3/ — for a chemical fact, cite its primary source (PubChem CID 24504); for a 3D model file, cite its MolGod ID, the variant and the SHA-256 from its licence record. Generator: MOL-GOD v3.12.33