---
kind: "section"
citation: "27 C.F.R. § 21.101"
title: "27"
number: "21.101"
heading: "tert-Butyl alcohol."
url: "https://uscodex.org/cfr/27/21.101"
---

# §21.101. tert-Butyl alcohol.

- (a) **Acidity (as acetic acid).** 0.003 percent by weight maximum.
- (b) **Color.** Colorless.
- (c) **Distillation range.** When 100 mL of tertiary butyl alcohol are distilled, none should distill below 78 °C. and none above 85 °C. More than 95 percent should distill between 81 °−83 °C.
- (d) **Dryness at 20 °C.** Miscible without turbidity with 19 volumes of 60° Bé1. gasoline.
- (e) **Freezing point (first needle).** Above 20 °C.
- (f) **Identification test.** Place five drops of a solution containing approximately 0.1 percent tertiary butyl alcohol in ethyl alcohol in a test tube. Add 2 mL of Denige's reagent (dissolve 5 grams of red mercuric oxide in 20 mL of concentrated sulfuric acid; add this solution to 80 mL of distilled water, and filter when cool). Heat the mixture just to the boiling point and remove from the flame. A yellow precipitate forms within a few seconds.
- (g) **Nonvolatile matter.** Less than 0.005 percent by weight.
- (h) **Odor.** Characteristic odor.
- (i) **Residual odor after evaporation.** None.
- (j) **Specific gravity at 25 °/25 °C.** 0.780 to 0.786.

## Notes

### Amendments

[T.D. ATF-133, 48 FR 24673, June 2, 1983. Redesignated by T.D. ATF-442, 66 FR 12854, Mar. 1, 2001]

### 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. ATF-133, 48 FR 24673, June 2, 1983. Redesignated by T.D. ATF-442, 66 FR 12854, Mar. 1, 2001]