---
kind: "section"
citation: "27 C.F.R. § 21.112-T3"
title: "27"
number: "21.112-T3"
heading: "High octane denaturant blend."
url: "https://uscodex.org/cfr/27/21.112-T3"
---

# §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.

## Notes

### Amendments

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

### Authority

Authority: 5 U.S.C. 552(a); 26 U.S.C. 5242, 7805.

### Source

Source: T.D. ATF-133, 48 FR 24673, June 2, 1983, unless otherwise noted.

### Amendments

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