27 CFR § 21.112-T3 - High octane denaturant blend.

---
identifier: "/us/cfr/t27/s21.112-T3"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "27 CFR § 21.112-T3 - High octane denaturant blend."
title_number: 27
title_name: "Alcohol, Tobacco Products and Firearms"
section_number: "21.112-T3"
section_name: "High octane denaturant blend."
chapter_name: "ALCOHOL AND TOBACCO TAX AND TRADE BUREAU, DEPARTMENT OF THE TREASURY"
subchapter_number: "A"
subchapter_name: "ALCOHOL"
part_number: "21"
part_name: "FORMULAS FOR DENATURED ALCOHOL AND RUM"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "5 U.S.C. 552(a); 26 U.S.C. 5242, 7805."
regulatory_source: "T.D. ATF-133, 48 FR 24673, June 2, 1983, unless otherwise noted."
cfr_part: "21"
---


# 21.112-T3 High octane denaturant blend.

(a) *API Gravity at 60 °F.* 40 to 65.

(b) *Reid Vapor Pressure (PSI).* 6 to 15.

(c) *Isopropyl alcohol.* 24 to 40 percent volume.

(d) *Methyl alcohol.* 1.6 to 9.6 percent volume.

(e) *Diisopropyl ether (DIPE).* 4 to 12 percent volume.

(f) *tert-Butyl alcohol.* 4 to 12 percent volume.

(g) *Iso-pentane.* 4 to 9 percent volume.

(h) *Pentane.* 4 to 9 percent volume.

(i) *Pentene.* 0 to 2.4 percent volume.

(j) *Hexane.* 2 to 6 percent volume.

(k) *Heptane.* 1 to 3 percent volume.

(l) *Sulfur (ppm).* 0 to 120.

(m) *Benzene (% vol.).* 0 to 1.1.

(n) *Distillation ( °F):*

(i) *10 percent.* 80 to 168.

(ii) *50 percent.* 250.

(iii) *End point distillation.* 437.

[T.D. TTB-140, 81 FR 59462, Aug. 30, 2016]