abstract |
In the present invention, 1,1,1,2-tetrafluoroethane, and 1,1-difluoroethane, 1-chloro-1,1-difluoroethane, dimethyl ether, perfluorocyclobutane, n- Described are azeotropic mixed compositions and azeotropic mixed compositions consisting of butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane and their use as blowing agents for refrigerants, aerosol propellants and polymeric foams. have. Azeotropic mixed compositions and azeotropic mixed compositions of 1,1,1,2-tetrafluoroethane and perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are extinguishing agents in fire It is also useful as. |