# Antimony Trioxide CAS: 1309-64-4 PubChem CID: 14794 InChIKey: GHPGOEFPKIHBNM-UHFFFAOYSA-N Wikidata: Q409035 Molecular formula: Sb₂O₃ Molar mass: 291.52 g/mol IUPAC: bis(antimony(3+));tris(oxygen(2-)) SMILES: [O-2].[O-2].[O-2].[Sb+3].[Sb+3] InChI: InChI=1S/3O.2Sb/q3*-2;2*+3 PSA: 3 A^2 Hydrogen bond donors: 0 Hydrogen bond acceptors: 3 Rotatable bonds: 0 Heavy atoms: 5 3D structure: 5 atoms, 0 bonds ## About the compound Antimony Trioxide is a chemical compound registered under CAS number 1309-64-4. Molecular formula: Sb₂O₃. Molar mass: 291.52 g/mol. The full systematic IUPAC name is: bis(antimony(3+));tris(oxygen(2-)). The molecule contains 5 atoms connected by 0 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/1309-64-4/ ## GHS classification Signal word: Warning Pictograms: GHS08 Classification status: Harmonised classification pursuant to Annex VI of the CLP Regulation (EC) 1272/2008 (official, binding classification). Index number: 051-005-00-X. Reference (Chicago): European Chemicals Agency. "antimony trioxide, Index No. 051-005-00-X." 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): H351: Suspected of causing cancer Precautionary statements (P): P201: Obtain special instructions before use P202: Do not handle until all safety precautions have been read and understood P260: Do not breathe dust/fume/gas/mist/vapours/spray P280: Wear protective gloves/protective clothing/eye protection/face protection P308+P313: IF exposed or concerned: Get medical advice/attention P405: Store locked up P501: Dispose of contents/container to an approved waste collection point ## Synonyms - Diantimony trioxide - Antimonious oxide - Antimony sesquioxide - Exitelite - Timonox - Twinkling star - Antimony White - Thermoguard B - Thermoguard L - Thermoguard S - White star - Fireshield H ## 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: Carc. 2 — H351 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: Section 14 of the safety data sheet states UN 1549, but without a confirmed ADR class — verify the transport class in ADR 2025 (Table A) before shipping. Do NOT assume there are no restrictions. 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 14794: https://pubchem.ncbi.nlm.nih.gov/compound/14794 - NIST WebBook: https://webbook.nist.gov/cgi/cbook.cgi?ID=1309-64-4 - ChEMBL: https://www.ebi.ac.uk/chembl/g/#search_results/all/query=1309-64-4 --- Standalone HTML page: https://molgod.org/molecule/1309-64-4/ Canonical: https://molgod.org/molecule/1309-64-4/ Markdown version: https://molgod.org/molecule/1309-64-4.md JSON API: https://molgod.org/wp-json/molgod/v1/molecule/1309-64-4 Last updated: 2026-10-04 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. "Antimony Trioxide (CAS 1309-64-4)." Last modified 2026-10-04. https://molgod.org/molecule/1309-64-4/ — for a chemical fact, cite its primary source (PubChem CID 14794); 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