CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER B—FOOD FOR HUMAN CONSUMPTION (parts 100 to 191) > PART 189—SUBSTANCES PROHIBITED FROM USE IN HUMAN FOOD > SUBPART C—Substances Generally Prohibited From Direct Addition or Use as Human Food (§189.110 to §189.191) > 189.191—Chlorofluorocarbon propellants.