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Phosphoric acid tributyl ester
Phosphoric acid tributyl ester, also known as tributyl phosphate or TBP, is an industrial chemical.
TBP is used mainly in industrial settings in aviation hydraulic fluids as a flame retardant, as an extraction solvent for rare earth metals from ores, in the manufacture of uranium trioxide, as a defoaming agent, as a plasticizer and in hydraulic fluid and coatings. It is also found in some paints and brake fluids.
TBP is not manufactured in Canada, but is imported into Canada.
Prior to the assessment, TBP was identified as a potential concern to human health based on its classification by international organizations as a substance which was found to cause cancer in laboratory animals, and based on a moderate potential for exposure to Canadians.
TBP may be found in indoor air and drinking water in Canada.
Canadians may be exposed to TBP during use of certain consumer products containing TBP such as paints and brake fluid.
Exposure of the general population in Canada to TBP is expected to be low.
The Government of Canada has conducted a science-based evaluation of TBP, called a screening assessment.
The Government of Canada has concluded that TBP is not harmful to human health at current levels of exposure.
Based on the conclusion of the final screening assessment, no further action will be taken on TBP.
The final screening assessment report was published on August 22, 2009.
Because Canadians' exposure to TBP is expected to be low, the Government of Canada is not currently recommending specific actions by Canadians to reduce their exposure.
As a general precaution, Canadians are reminded to carefully follow safety warnings and directions when using products containing TBP.
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