... refrigerant working substances to substitute Refrigerant gas R134a ,1,1,1,2-Tetrafluoroethane ,used in auto air condition,refrigerator,central ... air-condition.R-134a has been widly used as refrigerant in car ,super-market freezer,reach- ... refrigerators,cenrel air conditions,commercial refrigeration,and also been used in areas such as medicine,cosmetics,pesticide Physical Properties ...