... high heat produced by chemical reaction (exothermic reaction) to complete welding. Exothermic welding is also called as fireclay ... brass, bronze, copper, copper-clad steel, pure iron, stainless steel, ductile iron, zinc plated steel, cast iron, copper alloy, alloy steel and ... , pore removal agent, residue resistant agent, etc. to effectively assure welding quality and personnel operation safety.Product ...