... mould, etc; 2. Free grinding, grinding grade abrasive, applied in tube, optical glass, monocrystalline silicon, glasses, watches and clocks, glass, ... material; 5. Brown corundum functional filler - mainly used in automobile brake parts, special tires, special building products brought ... kinds of mold, such as wire drawing die, crowded pencil refill die nozzle, etc.; Do tool, mould abrasive, ...