Proposed Re-evaluation Decision PRVD2020-06, Chlorothalonil and Its Associated End-use Products, Used as a Preservative in Paints
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Pest Management Regulatory Agency
9 July 2020
ISSN: 1925-0967 (PDF version)
Catalogue number: H113-27/2020-6E-PDF (PDF version)
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Table of Contents
- Proposed re-evaluation decision
- Outcome of science evaluation
- Proposed regulatory decision for chlorothalonil
- International context
- Next steps
- Additional scientific information
Proposed re-evaluation decision
Under the authority of the Pest Control Products Act, all registered pesticides must be regularly re-evaluated by Health Canada’s Pest Management Regulatory Agency (PMRA) to ensure that they continue to meet current health and environmental safety standards and continue to have value. The re-evaluation considers data and information from pesticide manufacturers, published scientific reports, and other regulatory agencies. Health Canada applies internationally accepted risk assessment methods as well as current risk management approaches and policies.
This document (Proposed Re-evaluation Decision PRVD2020-06, Chlorothalonil and Its Associated End-use Products, Used as a Preservative in Paints) forms part of a re-evaluation assessment of several active ingredients used as preservatives in paints, coatings and related uses. As per Re-evaluation Note REV2018-02, Approach for the Re-Evaluation of Pesticides Used as Preservatives in Paints, Coatings and Related Uses, the paint-related uses of sodium omadine, chlorothalonil, dazomet, folpet and ziram were evaluated separately from other uses and relied on data provided by the registrants and the Antimicrobial Exposure Assessment Task Force II (AEATF II). This approach was adopted in order 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.
This document (Proposed Re-evaluation Decision PRVD2020-06, Chlorothalonil and Its Associated End-use Products, Used as a Preservative in Paints) presents the proposed regulatory decision for the re-evaluation of chlorothalonil used as a preservative in paints, including the proposed risk mitigation measures to further protect human health, as well as the science evaluation on which the proposed decision was based. All products registered in Canada containing chlorothalonil for use as a preservative in paints are subject to this proposed re-evaluation decision. PRVD2020-06 is subject to a 90-day public consultation period, during which the public, including the pesticide manufacturers and stakeholders, may submit written comments and additional information to Health Canada. The final re-evaluation decision will be published taking into consideration the comments and information received.
Chlorothalonil is used as a dry-film material preservative against bacterial and fungal contamination or spoilage of paint. All other registered uses of chlorothalonil (that is, agricultural and turf uses) were evaluated separately (Re-evaluation Decision RVD2018-11, Chlorothalonil and Its Associated End-use Products for Agricultural and Turf Uses).
Outcome of science evaluation
With respect to human health, risks of concern were identified for primary handlers (industrial manufacturers) handling chlorothalonil as a material preservative and for secondary handlers (professional and residential painters) applying chlorothalonil-treated paint using an airless sprayer. Therefore, mitigation measures for primary handlers (that is, closed transfer system for liquid formulations; additional personal protective equipment (PPE) and a reduction in amount handled per person per day for solid formulations) and for secondary handlers (that is, a reduction in the maximum rate of chlorothalonil used for solvent-based paint and exterior latex paint, and additional personal protective equipment for professional painters using an airless sprayer (all paint types)) are proposed.
Proposed regulatory decision for chlorothalonil
Under the authority of the Pest Control Products Act and based on the evaluation of currently available scientific information, Health Canada is proposing that products containing chlorothalonil for use as a material preservative in paint are acceptable for continued registration in Canada, provided that the proposed risk mitigation measures are in place.
To mitigate risks to primary handlers (mixers/loaders/applicators) manufacturing latex paints (interior and exterior) and solvent-based paints:
- Additional personal protective equipment (chemical-resistant coveralls over long-sleeved shirt and long pants, chemical-resistant gloves and a respirator) is required together with reducing the amount of active ingredient handled per worker per day to 4.51kg a.i. for the commercial-class solid dust products; and
- Closed transfer systems are required for the commercial-class liquid products.
To mitigate risks to secondary (professional and residential) handlers applying latex and solvent-based paints using an airless sprayer:
- Reduction of the maximum registered label rates from 9.8 g a.i./L (exterior latex paint) and 11.8 g a.i./L (solvent-based paint) to 8.5 g a.i./L for exterior latex paints and solvent based paints; and
- For professional handlers, additional personal protective equipment (cotton coveralls over a long-sleeved shirt and long pants, chemical-resistant gloves, a painter’s hat and respirator) coupled with an outreach/stewardship program (for solvent-based paint and latex paints (interior and exterior)).
Chlorothalonil is currently acceptable for use in some other Organisation for Economic Co‑operation and Development (OECD) member countries, including Australia, Mexico, New Zealand and the United States. The approval of chlorothalonil was not renewed for use as a plant protection product in the European Union. The European Union’s decision (April 2019) was based on human health and environmental concerns for the agricultural use of chlorothalonil, with a grace period for use ending in May 2020.
The public, including the registrants and stakeholders, are encouraged to submit additional information that could be used to refine risk assessments during the 90-day public consultation periodFootnote 1 upon publication of this proposed re-evaluation decision.
All comments received during the 90-day public consultation period will be taken into consideration in preparation of the re-evaluation decision document,Footnote 2 which could result in revised risk mitigation measures. The re-evaluation decision document will include the final re-evaluation decision, the reasons for it and a summary of comments received on the proposed re-evaluation decision with Health Canada’s responses.
Additional scientific information
No additional scientific data are being requested. However, during the consultation period, the registrants and other stakeholders may consider submitting the following information that may address uncertainties in the database of chlorothalonil and support a refined risk assessment. In addition, stakeholders may consider providing information on risk management options for chlorothalonil (for example, additional PPE, engineering controls).
The evaluation of any additional data would be based on the scientific merit and relevance to the risk assessment. While additional data may reduce uncertainty in the risk assessment, continued registration of any uses would be based on the acceptability of risk assessed using a science-based approach.
Additional detailed use description information that may allow further refinement of the risk assessment:
- Refined daily amounts of paint manufactured and treated with preservatives in Canada
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