Summary of Public Comments Received on the Government of Canada Draft Screening Assessment for Hexachloroethane [Chemical Abstracts Service Registry Number (CAS RN) 67-72-1]

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Comments received on the draft screening assessment for hexacloroethane to be addressed as part of the Chemicals Management Plan Challenge were submitted by the Canadian Vehicle Manufacturers’ Association (CVMA) and via the Organisation for Economic Co-operation and Development’s Cooperative Chemicals Assessment Programme (European Chemicals Agency, Japan).

A summary of comments and responses is presented below and organized by topic:

Summary of comments and responses
TopicCommentResponse
Follow-up OptionsThere are concerns with applying a significant new activity (SNAc) requirement to non-toxic substances as it increases regulatory burden on industry. It is unclear whether the Government of Canada has performed a cost-benefit analysis or explored applying other risk management options. Therefore, placing SNAcs and use limit restrictions on substances that do not meet criteria in Section 64 of the Canadian Environmental Protection Act, 1999 (CEPA) should be reconsidered.Although it is concluded that hexachloroethane does not meet criteria set out in paragraph 64 of CEPA, it is persistent and highly toxic to aquatic organisms and has some potential for bioaccumulation. Also, carcinogenic effects observed in experimental animals were considered to be non-genotoxic, and the resulting margin of exposure approach did not indicate a concern for human health. Hexachloroethane use in Canada has decreased over the years and current levels of exposure are not found to pose a problem. Follow-up options such as a SNAc or other tracking tools are not proposed for hexachloroethane at this time.

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Additional details from carcinogenicity and genotoxicity studies should be added to Appendix 2 of the screening assessment.Additional details added to Appendix 2 of the screening assessment.

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