(US5772911-A)      A refrigerant compsn. comprises 1,1,2,2,3,3,4,4- octafluorobutane and a 3-7C hydrocarbon.    Also claimed are: (i) a refrigerant compsn. comprising 1,1,2,2,3,3,4,4-octafluorobutane and ethyl formate, propylene oxide, bis(pentafluoroethyl) sulphide, dimethoxyethane or tetrahydrofuran; (ii) azeotropic or azeotrope-like compsns. comprising effective amts. of the above refrigerants; (iii) prodn. of refrigeration, by condensing one of the above compsns. and then evaporating the compsn. in the vicinity of the body to be cooled; (iv) producing heat by condensing a compsn. of the above in the vicinity of a body to be heated and then evaporating the compsn.; (v) prepn. of a thermoset or thermoplastic foam using one of the above compsns. as a blowing agent; (vi) process of cleaning a solid surface using a compsn. as above; and (vii) process for suppressing a fire, by applying to the fire one of the above compsns..    USE -   The compsns. can be used as refrigerants, cleaning agents, expansion agents for polyolefins 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 or displacement drying agents.    ADVANTAGE -   The compsns. have lower ozone depletion potential than existing refrigerants.    (JP10506890-W)      A refrigerant compsn. comprises 1,1,2,2,3,3,4,4- octafluorobutane and a 3-7C hydrocarbon.    Also claimed are: (i) a refrigerant compsn. comprising 1,1,2,2,3,3,4,4-octafluorobutane and ethyl formate, propylene oxide, bis(pentafluoroethyl) sulphide, dimethoxyethane or tetrahydrofuran; (ii) azeotropic or azeotrope-like compsns. comprising effective amts. of the above refrigerants; (iii) prodn. of refrigeration, by condensing one of the above compsns. and then evaporating the compsn. in the vicinity of the body to be cooled; (iv) producing heat by condensing a compsn. of the above in the vicinity of a body to be heated and then evaporating the compsn.; (v) prepn. of a thermoset or thermoplastic foam using one of the above compsns. as a blowing agent; (vi) process of cleaning a solid surface using a compsn. as above; and (vii) process for suppressing a fire, by applying to the fire one of the above compsns..    USE -   The compsns. can be used as refrigerants, cleaning agents, expansion agents for polyolefins 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 or displacement drying agents.    ADVANTAGE -   The compsns. have lower ozone depletion potential than existing refrigerants.    (EP783552-B1)      A refrigerant compsn. comprises 1,1,2,2,3,3,4,4- octafluorobutane and a 3-7C hydrocarbon.    Also claimed are: (i) a refrigerant compsn. comprising 1,1,2,2,3,3,4,4-octafluorobutane and ethyl formate, propylene oxide, bis(pentafluoroethyl) sulphide, dimethoxyethane or tetrahydrofuran; (ii) azeotropic or azeotrope-like compsns. comprising effective amts. of the above refrigerants; (iii) prodn. of refrigeration, by condensing one of the above compsns. and then evaporating the compsn. in the vicinity of the body to be cooled; (iv) producing heat by condensing a compsn. of the above in the vicinity of a body to be heated and then evaporating the compsn.; (v) prepn. of a thermoset or thermoplastic foam using one of the above compsns. as a blowing agent; (vi) process of cleaning a solid surface using a compsn. as above; and (vii) process for suppressing a fire, by applying to the fire one of the above compsns..    USE -   The compsns. can be used as refrigerants, cleaning agents, expansion agents for polyolefins 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 or displacement drying agents.    ADVANTAGE -   The compsns. have lower ozone depletion potential than existing refrigerants.