Toxic substances list: Tetrachlorobenzenes

Tetrachlorobenzenes (TeCBs) are not currently produced or used in their pure form in Canada, and there is currently no domestic commercial demand for TeCBs. Formerly, they could be found in dielectric fluids where they were used to top up polychlorinated biphenyl (PCB) transformers and in dyestuff carriers. These applications have either been discontinued (dye carriers) or are being phased out (dielectric fluids). A possible source of release may include dielectric PCB material still in use. TeCBs may be generated when organic compounds are burned or exposed to a large source of energy in the presence of a chlorine source. Through this mechanism, they may be formed and released to the environment as a result of waste incineration and barrel burning of household waste.

CAS (Chemical Abstracts Service) registry numbers: 12408-10-5, 84713-12-2, 634-90-2, 634-66-2 and 95-94-3

For more information on this substance, please visit the Chemical Substances website.

Risk assessment


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Substances Management Information Line
Chemicals Management Plan
Gatineau, QC K1A 0H3

Telephone: 1-800-567-1999  (in Canada) or 819-938-3232
Fax: 819-938-3231


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