21 CFR 173.355 - Dichlorodifluoromethane.
(a) The additive has a purity of not less than 99.97 percent.
(b) It is used or intended for use, in accordance with good manufacturing practice, as a direct-contact freezing agent for foods.
(c) To assure safe use of the additive:
(i) The name of the additive, dichlorodifluoromethane, with or without the parenthetical name “Food Freezant 12”.
(ii) The designation “food grade”.