Styrene
CAS: 100-42-5 | Type: monomer
High Risk (Adults)
Safety Summary
Hazard Profilehazardous
Risk (Adults)High
Regulatory Status
SummaryIARC: Group 2A | California Prop 65 listed
NGO listOn the TEDX List of Potential Endocrine Disruptors (The Endocrine Disruption Exchange, a non-governmental list; last updated September 2018). This is a list membership, not a regulatory classification. Source: the TEDX List export (publisher's page)
Molecular FormulaC8H8
Molecular Weight104.15
Food Safety Thresholds (Baby Food)
CA_Prop65 — SubstanceNo level set (safe_harbor_level)
Governance status, not safety advice — see the full coverage-gap & legal-force matrix.
Sources
These citations are the ones recorded for the human adult context.
- IARC Monographs Volume 121: Styrene, Styrene-7,8-Oxide, and Quinoline REGULATORY · 2019
- US EPA IRIS Assessment: Styrene REGULATORY · 2010
- CDC - NIOSH Pocket Guide to Chemical Hazards - Styrene REGULATORY
- Subpart D—Occupational Health and Environmental Controls REGULATORY
- § 1910.1000 Air contaminants. REGULATORY
- PROPOSITION 65 LIST OF CARCINOGENS OR REPRODUCTIVE TOXICANTS REGULATORY · 2026
- IARC Monographs, List of Classifications REGULATORY · 2026
- Substances Listed in the Fifteenth Report on Carcinogens REGULATORY
- Federal Contaminated Site Risk Assessment in Canada, Part II: Health Canada Toxicological Reference Values (TRVs) and Chemical-Specific Factors, Version 2.0 REGULATORY
- ECHA Annex VI to CLP: the unofficial Excel table (up to and including the 23rd ATP) (secondary: unofficial by its own statement) REGULATORY
- Industry Code of Practice on Chemicals Classification and Hazard Communication (DOSH Malaysia) REGULATORY
- identity database ECHA CHEM, Download all substances: REACH registrations (ECHA's own list of REACH-registered substances) REGULATORY · 2026
- where to look PubChem: Toxicity section (CID 7501) PUBCHEM
- TEDX List of Potential Endocrine Disruptors, full export (Excel from the publisher's own search, operator-saved 2026-10-08; list last updated September 2018) REFERENCE_DATABASE
- where to look CAMEO Chemicals, as recorded by PubChem (Experimental Properties, CID 7501; where-to-look, not a source of this value) DATABASE · 2026
- EPA CompTox CTX API: predicted properties for DTXSID2021284 (Styrene) REFERENCE
Same data as the API response, which is open and needs no key. The full per-record source list is available to authenticated callers.
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