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Di-tert-butyl peroxide

CAS 110-05-4 · 100/100 · High conf.

Also registered as 1 other CAS number

62534-71-8

Di-tert-butyl peroxide chemical structure

Concern score

100/100Critical concern driven by cmr.
High confidence

Di-tert-butyl peroxide in plain language

What it is

Also known as BIS(1,1-DIMETHYLETHYL)PEROXIDE · Dtbp · Tert-butylperoxide · 2-(tert-Butylperoxy)-2-methylpropane · Bis(1,1-dimethylethyl) peroxide · Bis(t-butyl)peroxide

Show all 27 names

Bis(tert-butyl) peroxide · Cadox · Cadox TBP · Di(tertiary-butyl) peroxide · Di-t-butyl peroxide · Di-t-butylperoxide · Di-tert-Butyl hydroperoxide · Di-tert-butyl peroxyde · Di-tert-butylperoxid · Di-tert.-butylperoxide · Interox DTB · Kayabutyl D · Luperox® DI · Perbutyl D · Perossido di butile terziario · Peroxide, bis(1,1-dimethylethyl) · Peroxyde de butyle tertiaire · T-butyl peroxide · Tert-butyl peroxide · Trigonox B · t-BuOOH

What it does

We don't have a plain-language description for Di-tert-butyl peroxide yet.

Recorded functional uses: Catalyst · Chemical reaction regulator · Hardener

Is it a concern?
Critical concern: classified for carcinogenic, mutagenic or reproductive toxicity (CMR). It is banned in EU cosmetics.

Why it's flagged

  • Cmr

Di-tert-butyl peroxide 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.

  • EU Annex II — prohibited
  • EU prohibited in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Industrial

  • EUEC

    Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Mutagenic Cat. 2()

    banned
    View source →
  • EUCosIngActiveCosmetics Regulation annex II / ref 1553.
    • Cosmetics Regulation annex II / ref 1553.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 11 composition records across product categories including Raw materials, Vehicle. EPA CPDat classifies this chemical for functional uses including Hardener, Chemical reaction regulator, Catalyst.
    • EPA CPDat observed this chemical in 11 composition records across product categories including Raw materials, Vehicle. EPA CPDat classifies this chemical for functional uses including Hardener, Chemical reaction regulator, Catalyst.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for Di-tert-butyl peroxide. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for Di-tert-butyl peroxide yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

7 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2020-07-30

    Open →

  • EPA Chemical and Products Database

    exposure · updated January 7, 2008

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →
Reference links (1)
Openfda substance

accessdata.fda.gov

Read →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

No fragrance-linked caution surfaced in the current profile.

Good fit

This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.

Where it has been recorded

How often EPA CPDat has listed Di-tert-butyl peroxide in a product composition. These are source records, not Greenveil catalog products.

Source records

11

Named organisations

6

Raw materialsVehicle

Typical roles

CatalystChemical reaction regulatorHardener
See products using Di-tert-butyl peroxide →