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3,3'-Dichlorobenzidine

CAS 91-94-1 · 100/100 · High conf.

Also registered as 1 other CAS number

86349-58-8

3,3'-Dichlorobenzidine chemical structure

Concern score

100/100Critical concern driven by cmr.
High confidence

3,3'-Dichlorobenzidine in plain language

What it is

Also known as 4-(4-amino-3-chlorophenyl)-2-chloroaniline · Dcb · 3,3'-DICHLORO-4,4'-BIPHENYLDIAMINE · 3,3'-Dichlorbenzidin · 3,3'-Dichloro-4,4'-diaminobiphenyl · 3,3'-Dichloro-4,4'-diaminodiphenyl

Show all 22 names

3,3'-Dichloro-p,p'-bianiline · 3,3'-Dichlorobenzidina · 3,3'-Dichlorobenzidine base · 3,3'-Dichlorobiphenyl-4,4'-diamine · 3,3'-dichlorobiphenyl-4,4'-ylenediamine · 3,3-Dichlorobenzidine · 4,4'-Diamino-3,3'-dichlorobiphenyl · 4,4'-Diamino-3,3'-dichlorodiphenyl · Benzidine, 3,3'-dichloro- · C.I. 23060 · Curithane C126 · Dichlorobenzidine, 3,3'- · Dichlorobenzidine base · RCRA waste number U073 · o,o'-Dichlorobenzidine · ortho'-Dichlorobenzidine ortho

What it does

We don't have a plain-language description for 3,3'-Dichlorobenzidine yet.

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

3,3'-Dichlorobenzidine 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: Carcinogenic Cat. 1B()

    banned
    View source →
  • EUCosIngActiveCosmetics Regulation annex II / ref 712.
    • Cosmetics Regulation annex II / ref 712.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 38 composition records across product categories including Furniture and furnishings, Laboratory supplies, Raw materials.
    • EPA CPDat observed this chemical in 38 composition records across product categories including Furniture and furnishings, Laboratory supplies, Raw materials.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 3,3'-Dichlorobenzidine. 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 3,3'-Dichlorobenzidine 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 2010-10-20

    Open →

  • EPA Chemical and Products Database

    exposure · updated March 8, 2019

    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 →

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 3,3'-Dichlorobenzidine in a product composition. These are source records, not Greenveil catalog products.

Source records

38

Named organisations

5

Furniture and furnishingsLaboratory suppliesRaw materials
See products using 3,3'-Dichlorobenzidine →