{"data":{"id":"us/21-cfr-178.3010","jurisdiction":"us","citation":"21 CFR 178.3010","heading":"Adjuvant substances used in the manufacture of foamed plastics.","body":"The following substances may be safely used as adjuvants in the manufacture of foamed plastics intended for use in contact with food, subject to any prescribed limitations:\nList of substances Limitations\nAzodicarbonamide For use as a blowing agent in polyethylene complying with item 2.1 in § 177.1520(c) of this chapter at a level not to exceed 5 percent by weight of finished foamed polyethylene.\n1,1-Difluoroethane (CAS Reg. No. 75-37-6) For use as a blowing agent in polystyrene.\nIsopentane For use as a blowing agent in polystyrene.\nn-Pentane Do.\n1,1,2,2-Tetra-chloroethylene For use only as a blowing agent adjuvant in polystyrene at a level not to exceed 0.3 percent by weight of finished foamed polystyrene intended for use in contact with food only of the types identified in § 176.170(c) of this chapter, table 1, under Categories I, II, VI, and VIII.\nToluene For use only as a blowing agent adjuvant in polystyrene at a level not to exceed 0.35 percent by weight of finished foamed polystyrene.","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 178—INDIRECT FOOD ADDITIVES: ADJUVANTS, PRODUCTION AIDS, AND SANITIZERS","Subpart D—Certain Adjuvants and Production Aids"],"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":"53849dd1307cd95bd93f23f61a781e8d5e1128ce0ad369a75e3ffa319f781118","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-178.2650","next":"us/21-cfr-178.3120"},"notice":"GroundRules: Original legal text. Not legal advice."}