21 C.F.R. § 173.220 1,3-Butylene glycol.
Title 21 - Food and Drugs
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 of the act preclude such use.
Title 21: Food and Drugs
PART 173—SECONDARY DIRECT FOOD ADDITIVES PERMITTED IN FOOD FOR HUMAN CONSUMPTION
Subpart C—Solvents, Lubricants, Release Agents and Related Substances
§ 173.220 1,3-Butylene glycol.
