o-Tolidine

Synonyms

3,3'-Dimethylbenzidine; 2-Tolidin [German]; 2-Tolidina [Italian]; 2-Tolidine; 3,3'-Dimethyl-(1,1'-biphenyl)-4,4'-diamine; 3,3'-Dimethyl-4,4'-biphenyldiamine; 3,3'-Dimethyl-4,4'-diaminobiphenyl; 3,3'-Dimethyl-4,4'-diphenyldiamine; 3,3'-Dimethylbenzidine; 3,3'-Tolidine; 4,4'-Bi-o-toluidine; 4,4'-Di-o-toluidine; 4,4'-Diamino-3,3'-dimethylbiphenyl; 4,4'-Diamino-3,3'-dimethyldiphenyl; Bianisidine; C.I. 37230; C.I. Azoic Diazo Component 113; CI 37230; CI Azoic diazo component 113; Diaminoditolyl; Diaminotolyl; Fast Dark Blue Base R; Orthotolidine; o-Tolidine; [ChemIDplus]

Category

Benzidine and Derivatives

Description

White to reddish crystals or powder. [Note: Darkens on exposure to air. Often used in paste or wet cake form. Used as a basis for many dyes.]; [NIOSH]

Sources/Uses

Used as an intermediate in the production of dyes and pigments; used as a curing agent for polyurethane elastomers, coatings, and rigid foams; [HSDB]

Comments

A carcinogen in experimental animals; [HSDB] In subchronic feeding studies, animals develop liver and kidney damage and bone marrow depression. [ACGIH] See "Benzidine."

Biomedical References

Yes

1E-06 mm Hg

Explanatory Notes

Carcinogen--No TLV; NIOSH recommends 60 minute ceiling of 0.02 mg/m3; Flash point = 137 deg C; VP from HSDB;

Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion

Possible (2b)

Anticipated human carcinogen

Confirmed Animal

Processes

Industrial Processes with risk of exposure:

• Plastic Composites Manufacturing