3,3'-Dichlorobenzidine (and its salts)

Synonyms & Trade Names

4,4'-Diamino-3,3'-dichlorobiphenyl, Dichlorobenzidine base, o,o'-Dichlorobenzidine, 3,3'-Dichlorobiphenyl-4,4'-diamine, 3,3'-Dichloro-4,4'-biphenyldiamine, 3,3'-Dichloro-4,4'-diaminobiphenyl

Physical Description

Gray to purple, crystalline solid.

Incompatibilities & Reactivities

None reported

Symptoms

Skin sensitization, dermatitis; headache, dizziness; caustic burns; frequent urination, dysuria; hematuria (blood in the urine); gastrointestinal upset; upper resp infection; [potential occupational carcinogen]

Cancer Site

[in animals: liver & bladder cancer]

Respirator Recommendations

(See Appendix E)

NIOSH

At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus

Escape:
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection