Toxic substances list: benzidine and benzidine dihydrochloride

Benzidine has been used primarily as an intermediate in the manufacture of dyes and pigments. It is not produced in Canada, and although it may have been imported in small amounts between 1980 and 1987, there no longer appears to be any commercial activity in Canada involving this substance. However, there are limited essential applications of benzidine related to analytical procedures in the health care sector.

CAS (Chemical Abstracts Service) registry number: 92-87-5 and 531-85-1

Risk assessment


This substance is entering the environment from the following sources:

Strategic options report

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Risk management tools

Tools developed to manage risks associated with the substance:


Consultation (past and present) on the substance:

Other information


Chemicals Management Division
Environment and Climate Change Canada
Gatineau, QC K1A 0H3


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Telephone: 1-800-567-1999 (in Canada) or 819-938-3232


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