21 C.F.R. § 173.360
The food additive octafluorocyclo-butane may be safely used as a propellant and aerating agent in foamed or sprayed food products in accordance with the following conditions:
(a) The food additive meets the following specifications:
99.99 percent octafluorocyclobutane. Less than 0.1 part per million fluoroolefins, calculated as perfluoroisobutylene.
(c) To assure safe use of the additive:
(1) The label of the food additive container shall bear, in addition to the other information required by the act, the following: