# tert-Butyl hydroperoxide

URL: https://app.greenveil.ai/ingredients/ingredient_cas_75_91_2
Categories: beauty, industrial
Functions: Catalyst, Chemical reaction regulator, Hardener
Identifier: 75-91-2

> tert-Butyl hydroperoxide is used as catalyst / chemical reaction regulator. Greenveil chemical-concern score: 100/100 — Critical concern driven by cmr.. Assessed from 6 sources.

## Safety assessment

- Chemical concern score: 100/100 — Critical concern driven by cmr.
- Confidence: 4
- Rationale: tert-Butyl hydroperoxide is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

## Regulatory status

- EU: banned — Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Mutagenic Cat. 2()
- US: commercial use observed — EPA CPDat observed this chemical in 20 composition records across product categories including Home maintenance, Construction and building materials. EPA CPDat classifies this chemical for functional uses including Catalyst, Hardener, Chemical reaction regulator.
- US: listed in openFDA substance — openFDA substance registry classifies this ingredient as chemical.

_Assessed by Greenveil._