copper clad flat steel 1, copper layer average thickness than 0.25mm; 2, ... ,ISO9001,UL XI'AN JSBOUND TECHNOLOGY CO.,LTD is a professional grounding and exothermic welding products manufacturer and export in china ... welding powder, grounding electrode, GEM and so on. copper clad flat steel 1, copper layer average thickness (conventional) ≥ 0.25mm; 2 ...