... could be used in low density corrosion circumstance,such as inorganic acid,alkali,kinds of salts,etc.The long using temperature is ... could be used in medium density corrosion circumstance,such as inorganic acid,alkali,kinds of salts,etc.The long using temperature is ... in very adverse corrosion circumstance such as acid,alkali,salt,dissolvent or acid & alkali in turn,etc. The long using temperature is ...