... ,1,1,1,2-Tetrafluoroethane ,used in auto air condition,refrigerator,central air-condition.R-134a has been widly used as ... , ppm≤0.1Critical Pressure,Mpa4.05Evaporating Residue,ppm≤100ODP0AppearanceColourless,No turbidGWP0.29OdorNo strange stenchLiquid Density,g/cm31.207 commercial refrigerator compressor r134a