Federal Register #2026-05773

This EPA final rule addresses the regulatory status of methyl end-capped polydimethylsiloxane (dimethylpolysiloxane) in pesticide formulations: - Government Buyer: - Environmental Protection Agency (EPA) - OEMs and Vendors: - Momentive Performance Materials, Inc. (petitioner) - Products/Services Requested: - No procurement of products or services; the rule establishes an exemption for dimethylpolysiloxane (CAS No. 63148629) as an inert ingredient in pesticides - No part numbers or quantities specified - Unique or Notable Requirements: - Exemption from tolerance requirements for residues of dimethylpolysiloxane in food/feed commodities - Applies when used in accordance with 40 CFR 180.960 - Based on classification as a low-risk polymer with no anticipated mammalian toxicity - Relevance: - Impacts agricultural producers, food manufacturers, and pesticide manufacturers (NAICS 111, 112, 311, 32532) - No procurement action or award is associated with this notice

This final rule by the Environmental Protection Agency establishes an exemption from the requirement of a tolerance for residues of methyl end-capped polydimethylsiloxane (dimethylpolysiloxane) when used as an inert ingredient in pesticide formulations. The regulation eliminates the need to set a maximum permissible residue level for this chemical on food or feed commodities when used according to the exemption. The rule is effective March 25, 2026, and objections or requests for hearings must be submitted by May 26, 2026. The exemption is based on the chemical's classification as a low-risk polymer with no anticipated mammalian toxicity from aggregate exposure.