... ,1,1,1,2-Tetrafluoroethane ,used in auto air condition,refrigerator,central air-condition.R-134a has ... been widly used as refrigerant in car , ... cenrel air conditions,commercial refrigeration,and also been used in areas such as medicine,cosmetics,pesticide Physical ... stenchLiquid Density,g/cm31.207 commercial refrigerator compressor r134a