1,1,2,2,3,3,4,4-octafluorocyclobutane 115-25-3 178459-70-6 Freon 318 Freon C 318 Cyclobutane, octafluoro- Cyclooctafluorobutane EINECS 204-075-2 FC-C 318 Freon C-318 Halocarbon C-138 Octafluorocyclobutane Octafluorocyclobutane, or Refrigerant gas R C318 [UN1976] [Nonflammable gas] PERFLUOROCYCLOBUTANE Propellant C318 R-C 318 UN1976 CHEBI:31007