(JP9504774-W)      A compsn. of hexa fluorodimethyl other end cyclopropane, dimethylether or propylene, bis(difluoromethyl) ether and 2, 2, 3, 4, 4-pentafluorooxetane; fluoromethyl trifluoromethyl ether and 2, 2, 4, 4, 5, 5-hexafluoro -1,3-dioxolane, 1-trifluoromethoxy- 1, 2, 2, 2-tetrafluoroethane, dimethylether or tris(trifluoromethyl) amine; trifluoromethyl methyl ether and perfluorooxetane, 2, 2, 4, 4, 5, 5-hexafluoro-1,3-dioxolane, perfluoromethyl ethyl ether, perfluorodimethoxy methane, 1-trifluoromethoxy -1, 2, 2, 2-tetrafluoro-ethane; dimethylether or tris (trifluoromethyl) amine; perfluoro-methyl ethyl ether and dimethylether or propylene; perfluoro- di methoxymethane and dimethylether or isobutane; 1-trifluoro- methoxy-1, 1, 2, 2-tetrafluoroethane and trio (trifluoromethyl) amine or dimethylether; difluoromethoxy pentafluoroethane and dimethylether, isobutane or tris (trifluoromethyl) amine; 1-trifluoromethoxy-1, 2, 2, 2-tetrafluoroethane and dimethylether or isobutane; 1-difluoromethoxy-1, 1, 2, 2-tetrafluoroethane and N(CHF2)2 (CF3) or 1, 1, 1, 2, 2, 3, 3-heptafluoro-3-(1, 2, 2, 2,-tetrafluoroethoxy) propane and 1, 1, 2, 2; 3-pentafluoropropane or 1, 1, 1, 2,3-pentafluoropropane.    Also claimed are:(i) effective amts. of the above cpds. to form an azeotropic or azeotrope-like compsn; (ii) effective amts. of the above cpds. the form binary compsn. having a vapour pressure higher than that of both of the components; (iii) prodn. of refrigeration, by condensing the above compsn. and then evaporating the compsn. in the vicinity of the body to be cooled; and (iv) prodn. of head by condensing the above compsns. in the vicinity of a body to be heated, and then evaporating the compsn.    USE -   The compsns. are useful as cleaning agents, expansion agents for polyolefin and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerisation media, particulate removal fluids, carrier fluids, buffing abrasive agents and displacement drying agents.    ADVANTAGE -   The compsn. has a lower ozone depletion potential than existing refrigeration.    (EP699222-B1)      A compsn. of hexa fluorodimethyl other end cyclopropane, dimethylether or propylene, bis(difluoromethyl) ether and 2, 2, 3, 4, 4-pentafluorooxetane; fluoromethyl trifluoromethyl ether and 2, 2, 4, 4, 5, 5-hexafluoro -1,3-dioxolane, 1-trifluoromethoxy- 1, 2, 2, 2-tetrafluoroethane, dimethylether or tris(trifluoromethyl) amine; trifluoromethyl methyl ether and perfluorooxetane, 2, 2, 4, 4, 5, 5-hexafluoro-1,3-dioxolane, perfluoromethyl ethyl ether, perfluorodimethoxy methane, 1-trifluoromethoxy -1, 2, 2, 2-tetrafluoro-ethane; dimethylether or tris (trifluoromethyl) amine; perfluoro-methyl ethyl ether and dimethylether or propylene; perfluoro- di methoxymethane and dimethylether or isobutane; 1-trifluoro- methoxy-1, 1, 2, 2-tetrafluoroethane and trio (trifluoromethyl) amine or dimethylether; difluoromethoxy pentafluoroethane and dimethylether, isobutane or tris (trifluoromethyl) amine; 1-trifluoromethoxy-1, 2, 2, 2-tetrafluoroethane and dimethylether or isobutane; 1-difluoromethoxy-1, 1, 2, 2-tetrafluoroethane and N(CHF2)2 (CF3) or 1, 1, 1, 2, 2, 3, 3-heptafluoro-3-(1, 2, 2, 2,-tetrafluoroethoxy) propane and 1, 1, 2, 2; 3-pentafluoropropane or 1, 1, 1, 2,3-pentafluoropropane.    Also claimed are:(i) effective amts. of the above cpds. to form an azeotropic or azeotrope-like compsn; (ii) effective amts. of the above cpds. the form binary compsn. having a vapour pressure higher than that of both of the components; (iii) prodn. of refrigeration, by condensing the above compsn. and then evaporating the compsn. in the vicinity of the body to be cooled; and (iv) prodn. of head by condensing the above compsns. in the vicinity of a body to be heated, and then evaporating the compsn.    USE -   The compsns. are useful as cleaning agents, expansion agents for polyolefin and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerisation media, particulate removal fluids, carrier fluids, buffing abrasive agents and displacement drying agents.    ADVANTAGE -   The compsn. has a lower ozone depletion potential than existing refrigeration.    (JP2923362-B2)      A compsn. of hexa fluorodimethyl other end cyclopropane, dimethylether or propylene, bis(difluoromethyl) ether and 2, 2, 3, 4, 4-pentafluorooxetane; fluoromethyl trifluoromethyl ether and 2, 2, 4, 4, 5, 5-hexafluoro -1,3-dioxolane, 1-trifluoromethoxy- 1, 2, 2, 2-tetrafluoroethane, dimethylether or tris(trifluoromethyl) amine; trifluoromethyl methyl ether and perfluorooxetane, 2, 2, 4, 4, 5, 5-hexafluoro-1,3-dioxolane, perfluoromethyl ethyl ether, perfluorodimethoxy methane, 1-trifluoromethoxy -1, 2, 2, 2-tetrafluoro-ethane; dimethylether or tris (trifluoromethyl) amine; perfluoro-methyl ethyl ether and dimethylether or propylene; perfluoro- di methoxymethane and dimethylether or isobutane; 1-trifluoro- methoxy-1, 1, 2, 2-tetrafluoroethane and trio (trifluoromethyl) amine or dimethylether; difluoromethoxy pentafluoroethane and dimethylether, isobutane or tris (trifluoromethyl) amine; 1-trifluoromethoxy-1, 2, 2, 2-tetrafluoroethane and dimethylether or isobutane; 1-difluoromethoxy-1, 1, 2, 2-tetrafluoroethane and N(CHF2)2 (CF3) or 1, 1, 1, 2, 2, 3, 3-heptafluoro-3-(1, 2, 2, 2,-tetrafluoroethoxy) propane and 1, 1, 2, 2; 3-pentafluoropropane or 1, 1, 1, 2,3-pentafluoropropane.    Also claimed are:(i) effective amts. of the above cpds. to form an azeotropic or azeotrope-like compsn; (ii) effective amts. of the above cpds. the form binary compsn. having a vapour pressure higher than that of both of the components; (iii) prodn. of refrigeration, by condensing the above compsn. and then evaporating the compsn. in the vicinity of the body to be cooled; and (iv) prodn. of head by condensing the above compsns. in the vicinity of a body to be heated, and then evaporating the compsn.    USE -   The compsns. are useful as cleaning agents, expansion agents for polyolefin and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerisation media, particulate removal fluids, carrier fluids, buffing abrasive agents and displacement drying agents.    ADVANTAGE -   The compsn. has a lower ozone depletion potential than existing refrigeration.