... /22.7kg; returnable cylinders 450kg/400L ,900kg/800L,ISO tank R22 refrigerant,foaming agentone-off cylinders 30b/13.6kg,50b/22.7kg ... Product Descriptionrefrigerant gasFeatures:1) Chlorodifluoromethane (HCFC-22) is a colorless gas at room temperature,and colorless, transparent, non-toxic, non-flammable ... : A, B, C7) Appearance: colorless and transparent 8) Odor: odorless R22 refrigerant,foaming agent