Fragrance avoidance
No fragrance-linked caution surfaced in the current profile.
This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.
- beauty
- industrial
2,3,4-Trichloro-1-butene
CAS 2431-50-7 · 100/100 · High conf.
Concern score
100/100Critical concern driven by cmr.
Well researched
Why it's flagged
- Cmr
2,3,4-Trichlorobut-1-ene is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.
RestrictedEU EC — banned
The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.
Regulation
Restrictions first, then routine listings from published regulatory sources.
- commercial_presence
- cpdat_category:industrial
- definition_level:complete
- definition_type:primary
- eu_annex:II
- eu_cmr
- eu_cosmetic_banned
- ingredient_type:ingredient substance
- View source →banned
EUEC
Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Carcinogenic Cat. 2(C=>0.1%)
USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products.
- EPA CPDat observed this chemical in 0 composition records across product categories including unclassified products.Source →
USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
- openFDA substance registry classifies this ingredient as chemical.Source →
Evidence
No graded sources yet for 2,3,4-Trichloro-1-butene. We publish evidence only once a source is linked and reviewed — this ingredient is in the catalog, but has not been assessed.
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Good fit
Where it appears
Prevalence of 2,3,4-Trichloro-1-butene in our catalog (epa_cpdat).
Brands
1