... acids, saline solutions and organic solvents, liquid or gas covering the complete acid,neutral and alkali range ... treatment, it can prevent secondary contamination;Applied for gas filtration,and filtration of electroplating wastewater containing Zn, ... oil field recharge water. Filtering vapour,chlorine,oxygen,coke-oven gas, sulfur trioxide,nitrogen pentoxide,carbon dioxide,methane,hydrogen, acetylene. ...