Substance Information

NB: Registration status and tonnage

  • The REACH Registered substance portal was updated on 9th November 2020; the REACH registered factsheets were further updated on 21st December 2020. Details of the improvements can be found at Dissemination Platform Updates. Reprocessing the entire dataset is ongoing since 21 December 2020. ECHA is making all possible efforts to synchronise the registration status and tonnage with the shortest delay.
  • While reprocessing is ongoing please note that substances whose registration dossiers are not yet processed can incorrectly state in the Infocard that they are not registered under REACH. In these cases if there is a link to a REACH registered substance factsheet then the substance IS registered. The correct total tonnage band can be found in the factsheet(s) for the substance.

Substance Infocard


Benzidine, its salts and benzidine derivatives

EC / List no.: -

CAS no.: -

Mol. Formula:

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Key datasets

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Regulatory context

Here you can find all of the regulations and regulatory lists in which this substance appears, according to the data available to ECHA. This substance has been found in the following regulatory activities (directly, or inheriting the regulatory context of a parent substance):

PIC - Prior Informed Consent Regulation
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Substance names and other identifiers

Regulatory process names
Benzidine, its salts and benzidine derivatives
Other identifiers
2921 59 90
Combined Nomenclature Code
2921 59 90
Combined Nomenclature Number
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Group members

This entry / group of substance has the following member substances:

Name EC / List no. CAS no. Association
3,3-Diaminobenzidine tetrahydrochloride 685-525-9 868272-85-9 Expert judgement
N,N,N',N'-tetraphenyl[1,1'-biphenyl]-4,4'-diamine 239-599-0 15546-43-7 Expert judgement
4,4'-[[1,1'-biphenyl]-4,4'-diyldiazo]bis[4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic] acid, sodium salt 303-425-2 94199-52-7 Expert judgement
2,2'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[N-(4-chlorophenyl)-3-oxobutyramide] 304-380-1 94249-03-3 Expert judgement
3,3'-dimethoxybiphenyl-4,4'-ylenediammonium dichloride 243-737-5 20325-40-0 Expert judgement
Benzidine sulphate 244-236-4 21136-70-9 Expert judgement
[1,1'-Biphenyl]-4,4'-diamine, reaction products with 4-(6-methyl-2-benzothiazolyl)benzenamine, 4-(6-methyl[2,6'-bibenzothiazol]-2'-yl)benzenamine and sodium sulfide 290-814-4 90268-15-8 Expert judgement
2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, coupled with 4-amino-5-hydroxy-2-naphthalenesulfonic acid, diazotized 4-aminobenzenesulfonic acid and diazotized [1,1'-biphenyl]-4,4'-diamine 291-628-6 90431-98-4 Expert judgement
3,3',5,5'-tetramethylbenzidine 259-364-6 54827-17-7 Expert judgement
3,3',5,5'-tetramethyl[1,1'-biphenyl]-4,4'-diamine dihydrochloride 264-769-6 64285-73-0 Expert judgement
3,3'-dichlorobenzidine dihydrogen bis(sulphate) 265-293-1 64969-34-2 Expert judgement
3,3'-dichlorobenzidine sulphate 277-822-3 74332-73-3 Expert judgement
3,3'-dimethoxybenzidine 204-355-4 119-90-4 Expert judgement
4,4'-bi-o-toluidine 204-358-0 119-93-7 Expert judgement
Benzidine dihydrochloride 208-519-6 531-85-1 Expert judgement
[[1,1'-biphenyl]-4,4'-diyl]diammonium sulphate 208-520-1 531-86-2 Expert judgement
N,N'-diphenylbenzidine 208-521-7 531-91-9 Expert judgement
3,3'-dichlorobenzidine dihydrochloride 210-323-0 612-83-9 Expert judgement
3,3'-dichlorobenzidine 202-109-0 91-94-1 Expert judgement
Biphenyl-3,3',4,4'-tetrayltetraamine 202-110-6 91-95-2 Expert judgement
Benzidine 202-199-1 92-87-5 Expert judgement
[1,1'-biphenyl]-4,4'-diamine, reaction products with 1-methyl-2,4-dinitrobenzene and sodium sulfide (Na2(Sx))
This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 53025.
215-424-3 1326-43-8 Expert judgement
[1,1'-biphenyl]-4,4'-diamine, reaction products with 4-methyl-1,3-benzenediamine and sulfur
This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 53105.
215-436-9 1326-63-2 Expert judgement
Acetamide, N-(2-methylphenyl)-, reaction products with [1,1'-biphenyl]-4,4'-diamine and sulfur, leuco derivatives
This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 53150.
215-439-5 1326-73-4 Expert judgement
[1,1'-biphenyl]-4,4'-diamine, reaction products with 4-(6-methyl-2-benzothiazolyl)benzenamine and sulfur
This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 53160.
215-440-0 1326-75-6 Expert judgement
Disodium 8,8'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(7-hydroxynaphthalene-1-sulphonate) 218-959-0 2302-97-8 Expert judgement
Benzidine acetate 252-984-8 36341-27-2 Expert judgement
3,3′,5,5′-Tetramethylbenzidine dihydrochloride hydrate 688-511-0 207738-08-7 Expert judgement

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