... of 4-methyl-benzotriazole and 5 -methyl-benz-otriazole, the melting point is from 80°C to 86°C, soluble in alcohol ... as antitrust and corrosion inhibitor for metals (such as silver, copper, zinc, lead, nickel, etc..), and for antitrust oil (tallow) ... products, the gas phase corrosion inhibitor of copper and aldary, lubricant additive, cycle water treating compound and auto ...