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Canada - Final Regulatory Action
Cyhexatin CAS number:
Date circular:

Chemical name: Tricyclohexyltin hydroxide

Final regulatory action has been taken for the category: Pesticide

Final regulatory action: The chemical is Banned

Use or uses prohibited by the final regulatory action:

All formulations prohibited from import, sale or use.

Pesticide use or uses that remain allowed:


The final regulatory action was based on a risk or hazard evaluation: Yes

Summary of the final regulatory action:

No pest control uses are allowed
Dow announced voluntary withdrawal of the product from the market, supported by a stock return and refund program coordinated through local dealers.
CAPCO Note in August 1987 cautioned women who are or may be pregnant against working in treated orchards or fields.
Dow took corporate decision to abandon further interest in Plictran and asked for original registration to be cancelled
Agriculture Canada put growers on notice that Health and Welfare Canada has revoked residue tolerances, effective January 29, 1989.

The reasons for the final regulatory action were relevant to: Human health

Summary of known hazards and risks to human health:

teratogenic in rats and rabbits at low doses (see S 1.8.2)
margin of safety low even in cases where a rubber suit and gloves were utilized.

Expected effect of the final regulatory action in relation to human health:

Removal of risk to orchard/field workers where Piclam was used.

Date of entry into force of the final regulatory action: 31/12/1989