Consultations on the re-evaluations of pesticides used as preservatives in paints, coatings and related uses

Update

As of 3 September 2020, the consultation period has been extended. Interested parties are encouraged to provide comments and suggestions by 6 December 2020.

Pest Management Regulatory Agency
9 July 2020

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Health Canada is consulting Canadians on the proposed re-evaluation decisions on the material preservative uses of pesticide active ingredients sodium omadine, ziram, folpet, chlorothalonil and dazomet, as well as the proposed special review decision for diodofon.

The paint-related uses of sodium omadine, ziram, folpet, chlorothalonil and dazomet have been evaluated separately from other uses of those active ingredients, as per Re-evaluation Note REV2018-02, Approach for the Re-Evaluation of Pesticides Used as Preservatives in Paints, Coatings and Related Uses. This approach was adopted to obtain and review paint-related studies, have risk assessments more reflective of current and realistic exposure scenarios, and to allow for a consistent approach to the risk assessment and risk management for these uses.

The consultations are open for comment from 9 July 2020 to 7 October 2020. Instructions on how to comment and next steps are at the bottom of this page.

Proposed re-evaluation decision for sodium omadine

Sodium omadine is used as an “in-can” preservative of latex emulsions used in adhesives, caulks, patching compounds, sealants, paints and grouts against bacterial and fungal contamination and spoilage. Health Canada is proposing products using sodium omadine as a material preservative are acceptable for continued registration in Canada, provided the proposed risk mitigation measures are in place.

Risks of concern were identified for primary handlers (industrial manufacturers) and for secondary handlers (professional and residential) using sodium omadine-treated products. Therefore, mitigation measures for primary and secondary handlers are proposed.

Refer to PRVD2020-03, Sodium Omadine and Its Associated End-use Products, Used as a Preservative in Paints, Coatings and Related Uses for more information.

All other registered uses of sodium omadine (for the preservation of aqueous based metalworking, cutting, cooling and lubrication fluids and fluid concentrates; and gypsum wallboards) were evaluated separately in RVD2018-06, Sodium Omadine and Its Associated End-use Product.

Proposed re-evaluation decision for ziram

Ziram is an “in-can” material preservative used to control bacterial and fungal degradation of dry starch and synthetic latex adhesives. The only other registered use of ziram, as a protectant fungicide in agriculture, was evaluated separately (Re-evaluation Decision RVD 2018-39, Ziram and Its Associated End-use Products for Agricultural Uses); all registered agricultural uses in Canada were cancelled.

When using ziram as a material preservative, risks of concern were identified for occupational workers (mixing/loading the end-use product and handling the impregnated dry starch and latex adhesives) and residential handlers. Therefore, the use of ziram as a material preservative in adhesives is proposed for cancellation.

Refer to PRVD2020-04, Ziram and Its Associated End-use Products, Used as a Preservative in Adhesives for more information.

Proposed re-evaluation decision for folpet

Folpet is a dry-film material preservative used to control bacterial and fungal degradation in solvent-based paints and vinyl plastics (gaskets, roof membranes, exterior vinyl products including artificial leather for outdoor seating, truck covers, industrial tents and outdoor architectural fabrics). Health Canada is proposing that use of folpet as a material preservative in vinyl plastics is acceptable for continued registration in Canada, provided the proposed risk mitigation measures are in place to address risks of concern for primary handlers (industrial manufacturers). The use of folpet as a material preservative in paint has not been shown to be acceptable and is proposed for cancellation.

Refer to PRVD2020-05, Folpet and Its Associated End-use Products, Used as a Preservative in Paints and Vinyl Plastics for more information.

All other registered uses of folpet (as a fungicide on food and ornamental crops) were evaluated separately in PRVD2018-05, Folpet and Its Associated End-use Products and RVD2020-02, Folpet and Its Associated End-use Products for Agricultural Uses.

Proposed re-evaluation decision for chlorothalonil

Chlorothalonil is used as a dry-film material preservative against bacterial and fungal contamination or spoilage of paint. Health Canada is proposing that products containing chlorothalonil for use as a material preservative in paint are acceptable for continued registration in Canada, provided measures are in place to mitigate risks for primary handlers (industrial manufacturers) and secondary handlers (professional and residential painters).

Refer to PRVD2020-06, Chlorothalonil and Its Associated End-use Products, Used as a Preservative in Paints for more information.

All other registered uses of chlorothalonil (for agricultural and turf uses) were evaluated separately in RVD2018-11, Chlorothalonil and Its Associated End-use Products for Agricultural and Turf Uses.

Proposed re-evaluation decision for dazomet

Dazomet is an “in-can” material preservative against bacterial and fungal contamination or spoilage of adhesives, adhesive coatings, latex paints, aqueous emulsions, coatings, slurries, paper, paper coatings, concrete admixtures and high viscosity suspensions. Health Canada is proposing cancellation of the paper and paper coating uses of dazomet, while products containing dazomet for other material preservative uses are acceptable for continued registration in Canada, provided proposed risk mitigation measures are in place.

Risks of concern were identified for industrial manufacturers (primary handlers of dazomet as a material preservative and downstream postapplication workers) and for secondary handlers (professionals) applying dazomet-treated paint and building materials. Therefore, mitigation measures for primary and for secondary professional handlers are proposed. Refer to PRVD2020-07, Dazomet and Its Associated End-use Products, Used as a Preservative in Paints, Coatings and Related Uses for more information.

All other registered uses of dazomet (as a non-selective pre-plant soil fumigant and a slimicide in industrial process fluids) were evaluated separately in RVD2018-34, Dazomet and Its Associated End-use Products.

Proposed special review decision for diodofon

Diodofon is an antimicrobial active ingredient used as a material preservative in a variety of aqueous based products and building materials, and during leather tanning to provide protection against bacterial and fungal degradation. A special review for diodofon was initiated in 2016 with the following aspects of concern: potential postapplication risks to workers and residential users, and potential risks to workers mixing/loading/applying.

Health Canada is proposing products using diodofon as a material preservative are acceptable for continued registration in Canada, provided the proposed risk mitigation measures are in place. The following uses of diodofon were not shown to be acceptable and are proposed for cancellation: leather tanning, wallboard joint compound, and exterior paints.

Read more details in PSRD2020-01, Special Review of Diodofon and Its Associated End-use Products.

How to comment

These consultations are open for comment from 9 July 2020 to 7 October 2020 (90 calendar days).

To comment on PRVD2020-03, PRVD2020-04, PRVD2020-05, PRVD2020-06, PRVD2020-07 or PSRD2020-01:

Step 1  Request the full consultation document for PRVD2020-03, PRVD2020-04, PRVD2020-05, PRVD2020-06, PRVD2020-07 or PSRD2020-01: to read the Science Evaluation that is the basis of the proposed regulatory decision.

Step 2  Submit comments to the PMRA Publications Section.

All comments received will be considered. Stakeholders may wish to provide information on the feasibility of these proposed changes, as well as potential impacts on pest management practices.

Please refer to the document title when providing comments.

Next steps and reporting to Canadians

Once the decisions are finalized, the PMRA will post Re-evaluation and Special Review Decisions on the Pesticides and Pest Management Reports and Publications portion of Canada.ca.

If you have any questions, contact the Pest Management Information Service.

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