# n-Butyl 3-hydroxybutyrate and Isopropyl 3-hydroxybutyrate; Exemption From the Requirement of a Tolerance
> **Rule** · Final rule. · Published 2016-08-15 · Effective 2016-08-15 · 81 FR 53931
## Document
- **Document number:** 2016-19115
- **Category:** pesticide
- **Federal Register citation:** 81 FR 53931
- **CFR reference:** 40 CFR 180
- **Publication date:** 2016-08-15
- **Effective date:** 2016-08-15
- **EPA docket:** EPA-HQ-OPP-2015-0719
## Abstract

This regulation establishes exemptions from the requirement of a tolerance for residues of n-butyl 3-hydroxybutyrate (CAS Reg. No. 53605-94-0) and isopropyl 3-hydroxybutyrate (CAS Reg. No. 54074-94-1) when used as inert ingredients (solvents) in pesticide formulations applied to growing crops or raw agricultural commodities after harvest; to animals; and to food contact surfaces in public eating places, dairy-processing equipment, and food-processing equipment and utensils. Steptoe and Johnson, on behalf of Eastman Chemical Company, submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting establishment of these exemptions from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of n-butyl 3-hydroxybutyrate and isopropyl 3-hydroxybutyrate when applied or used under these conditions.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/08/15/2016-19115/n-butyl-3-hydroxybutyrate-and-isopropyl-3-hydroxybutyrate-exemption-from-the-requirement-of-a)
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