# Dimethylpolysiloxane in Pesticide Formulations; Exemption From the Requirement for a Tolerance
> **Rule** · Final rule. · Published 2026-03-25 · Effective 2026-03-25 · 91 FR 14461
## Document
- **Document number:** 2026-05773
- **Category:** pesticide
- **Federal Register citation:** 91 FR 14461
- **CFR reference:** 40 CFR 180
- **Publication date:** 2026-03-25
- **Effective date:** 2026-03-25
- **EPA docket:** EPA-HQ-OPP-2024-0109
## Abstract

This regulation establishes an exemption from the requirement of a tolerance for residues of methyl end-capped polydimethylsiloxane (CAS Reg. No 63148-62-9); also known as dimethylpolysiloxane when used as an inert ingredient in a pesticide chemical formulation under 40 CFR 180.960. Momentive Performance Materials, Inc submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of methyl end-capped polydimethylsiloxane on food or feed commodities when used in accordance with these exemptions.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/03/25/2026-05773/dimethylpolysiloxane-in-pesticide-formulations-exemption-from-the-requirement-for-a-tolerance)
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