---
kind: "section"
citation: "21 C.F.R. § 173.220"
title: "21"
number: "173.220"
heading: "1,3-Butylene glycol."
url: "https://uscodex.org/cfr/21/173.220"
---

# §173.220. 1,3-Butylene glycol.


1,3-Butylene glycol (1,3-butanediol) may be safely used in food in accordance with the following prescribed conditions:

- (a) **The substance meets the following specifications—**
  - (1) 1,3-Butylene glycol content: Not less than 99 percent.
  - (2) **Specific gravity at 20/20 °C—** 1.004 to 1.006.
  - (3) **Distillation range—** 200°-215 °C.
- (b) **It is used in the minimum amount required to perform its intended effect.**
- (c) It is used as a solvent for natural and synthetic flavoring substances except where standards of identity issued under [section 401](/cfr/21/401.md) of the act preclude such use.

## Notes

### Authority

Authority: 21 U.S.C. 321, 342, 348.

### Source

Source: 42 FR 14526, Mar. 15, 1977, unless otherwise noted.