It contains Sodium Tolyltriazole ( CAS No- 64665-57-2 ) which is mainly used as antirust and corrosion inhibitor for metals (such as silver, copper, zinc, lead, nickel, etc..), and for antirust oil (tallow) products, the gas phase corrosion inhibitor of copper and copper alloy, lubricant additive, cycle water treating compound and auto antifreeze. It also can be used with manifold sterilization algaecide and has a very fine corrosion mitigation effect on close cycle cooling water system.