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40 CFR § 180.590 - 2, 6-Diisopropylnaphthalene (2, 6-DIPN); tolerances for residues. 

---
identifier: "/us/cfr/t40/s180.590"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 180.590 - 2, 6-Diisopropylnaphthalene (2, 6-DIPN); tolerances for residues."
title_number: 40
title_name: "Protection of Environment"
section_number: "180.590"
section_name: "2, 6-Diisopropylnaphthalene (2, 6-DIPN); tolerances for residues."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "E"
subchapter_name: "PESTICIDE PROGRAMS"
part_number: "180"
part_name: "TOLERANCES AND EXEMPTIONS FOR PESTICIDE CHEMICAL RESIDUES IN FOOD"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 321(q), 346a and 371."
regulatory_source: "36 FR 22540, Nov. 25, 1971, unless otherwise noted."
cfr_part: "180"
---

# 180.590 2, 6-Diisopropylnaphthalene (2, 6-DIPN); tolerances for residues.

(a) *General.* Tolerances are established for residues of the growth inhibitor 2,6-DIPN, including its metabolites and degradates, in or on the commodities in the following table. Compliance with the tolerance levels specified in the following table is to be determined by measuring only 2,6-Diisopropylnaphthalene.

| Commodity | Parts per million |
| --- | --- |
| Cattle, fat | 0.2 |
| Cattle, meat | 0.02 |
| Cattle, meat byproducts, except fat | 0.02 |
| Goat, fat | 0.2 |
| Goat, meat | 0.02 |
| Goat, meat byproducts, except fat | 0.02 |
| Horse, fat | 0.2 |
| Horse, meat | 0.02 |
| Horse, meat byproducts, except fat | 0.02 |
| Milk, fat | 0.02 |
| Potato, granules/flakes | 5.5 |
| Potato, wet peel | 6.0 |
| Potato, whole | 2.0 |
| Sheep, fat | 0.2 |
| Sheep, meat | 0.02 |
| Sheep, meat byproducts, except fat | 0.02 |

(b) *Section 18 emergency exemptions.* [Reserved]

(c) *Tolerances with regional registrations.* [Reserved]

(d) *Indirect or inadvertent residues.* [Reserved]

[71 FR 52011, Sept. 1, 2006, as amended at 74 FR 66579, Dec. 16, 2009; 77 FR 32406, June 1, 2012]