1,1-Difluoroethane (R152a, HFC-152a) Description: Appearance:colorless transparent liquid Content: 99.9% Acidity(HCl), mg/kg: 1 Moisture mg/kg: 10 Evaporation residue mg/kg: CAS NO.: 75-37-6 HS CODE: 290339 Country of origin: China Annual output: 3500 tons