{"data":{"id":"us/21-cfr-173.220","jurisdiction":"us","citation":"21 CFR 173.220","heading":"1,3-Butylene glycol.","body":"1,3-Butylene glycol (1,3-butanediol) may be safely used in food in accordance with the following prescribed conditions:\n(a) The substance meets the following specifications:\n(1) 1,3-Butylene glycol content: Not less than 99 percent.\n(2) Specific gravity at 20/20 °C: 1.004 to 1.006.\n(3) Distillation range: 200°-215 °C.\n(b) It is used in the minimum amount required to perform its intended effect.\n(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.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER B—FOOD FOR HUMAN CONSUMPTION","PART 173—SECONDARY DIRECT FOOD ADDITIVES PERMITTED IN FOOD FOR HUMAN CONSUMPTION","Subpart C—Solvents, Lubricants, Release Agents and Related Substances"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"cc5daca681b81e40977f74ba3e4526d3cbe0c8c9876533be4cc32a1c1d053275","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-173.210","next":"us/21-cfr-173.228"},"notice":"GroundRules: Original legal text. Not legal advice."}