Proposed Re-evaluation Decision PRVD2020-07, Dazomet and Its Associated End-use Products, Used as a Preservative in Paints, Coatings and Related Uses
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Pest Management Regulatory Agency
9 July 2020
ISSN: 1925-0967 (PDF version)
Catalogue number: H113-27/2020-7E-PDF (PDF version)
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Table of Contents
- Proposed re-evaluation decision
- Outcome of science evaluation
- Proposed regulatory decision for dazomet
- 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 PRVD2020-07, Dazomet and Its Associated End-use Products, Used as a Preservative in Paints, Coatings and Related Uses) 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 PRVD2020-07, Dazomet and Its Associated End-use Products, Used as a Preservative in Paints, Coatings and Related Uses) presents the proposed regulatory decision for the re-evaluation of dazomet, used as a preservative in paints, coatings and related uses, 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 dazomet for use as a preservative in paints, coatings and related uses are subject to this proposed re-evaluation decision. PRVD2020-07 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.
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. All other registered uses of dazomet (that is, as a non-selective pre-plant soil fumigant and a slimicide in industrial process fluids (for example, pulp and paper mills, recirculating water cooling towers, industrial air washers and oilfield industry)) were evaluated separately (Re-evaluation Decision RVD2018‑34, Dazomet and Its Associated End-use Products).
Outcome of science evaluation
With respect to human health, 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 handlers (that is, closed transfer system for liquid formulations; additional personal protective equipment (PPE) for handling all solid formulations; a reduction in amount handled per person per day for soluble and wettable powders; and cancellation of the paper and paper coatings uses), and for secondary professional handlers (that is, reduction in the maximum rate of dazomet for all uses and additional PPE for professional painters using an airless sprayer) are proposed.
Proposed regulatory decision for dazomet
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 dazomet for use as a material preservative are acceptable for continued registration in Canada, provided that the proposed risk mitigation measures are in place.
To mitigate risks to primary (industrial manufacturing) and/or secondary (professional) handlers:
- Cancellation of the paper and paper coatings uses.
- Reduction of maximum label rates for all other uses to 0.53 g a.i./kg product.
To mitigate risks to primary handlers (mixers/loaders/applicators) in industrial manufacturing facilities, for all uses:
- For commercial-class solid products (wettable powder, soluble powder and granular):
- Additional personal protective equipment (chemical-resistant coveralls over a long-sleeved shirt, long pants, chemical-resistant gloves, socks and chemical-resistant footwear, eye protection (goggles or a faceshield) and a respirator) when mixing/loading; and
- Reduction in the amount of active ingredient handled per worker per day for wettable powder and soluble powder formulations to 3.36 kg a.i./person/day
- For commercial-class liquid products (solutions/suspensions/emulsifiable concentrates):
- Closed transfer systems.
To mitigate risks to secondary (professional) handlers applying latex paints using an airless sprayer:
- Additional personal protective equipment (cotton coveralls over single-layer, chemical-resistant gloves, painter’s hat, respirator) coupled with an outreach/stewardship program.
Dazomet is currently acceptable for use in other Organisation for Economic Co-operation and Development (OECD) member countries, including the European Union, Australia, New Zealand, Mexico and the United States. No decision by an OECD-member country to prohibit all uses of dazomet for health or environmental reasons has been identified.
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 available information database of dazomet and support refined risk assessment. In addition, stakeholders may consider providing information on risk management options for dazomet (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 and other data/information that may allow further refinement of the risk assessment:
- Refined daily amounts of paint manufactured and treated with preservatives in Canada
- Actual daily amounts of paint-related uses/building materials treated with preservatives and handled by professional secondary handlers
- Chemical-specific dermal absorption studies conducted with dazomet-treated paint formulations
- Chemical-specific air monitoring study measuring MITC air concentrations in paper mills using dazomet as a biocide in coating operations.
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