... IEEE std.80-1976.Exothermic welding mainly weld pure copper, brass, bronze, copper, copper-clad steel, pure iron, stainless steel, ductile iron ... , zinc plated steel, cast iron, copper alloy, alloy steel and etc.Welding materials produced by our ... gasses has no pollution to atmosphere.Our company adopts unique formula with delay reactant, pore removal agent, residue resistant agent ...