Material dumplings corundum, high hardness, toughness. For high tensile strength metal material grinding, such as general carbon steel, alloy steel, malleable iron and hard bronze harder than corundum corundum, grit easily broken, sharp edges and corners, and good cutting, grinding heat and small. For hard materials, strong steel grinding heat sensitive, such as hardened steel, high carbon steel, general high speed steel, alloy steel grinding, mainly for tools, office tools, molds, gears, threads, thin wall parts such as cutting and forming mill extravagant type. Ming corundum and corundum hardness similar toughness than white corundum, abrasive cutting edges sharp edges and corners to maintain good, durability is higher. For hardened steel, alloy steel, tool and workpiece grinding and measuring and instrument parts such as precision grinding, also apply to forming grinding. Single product with brown corundum, white corundum compared to high hardness, toughness, showed a single particle spherical crystals with good clothing Duoleng cutting edge crush resistance strong for stainless steel, high speed steel and other alum high hardness, toughness and easily deformed, easy to burn for workpiece grinding. Microcrystalline corundum: abrasive made up of tiny crystals, toughness, high strength, good self-sharpening abrasive. For bearing steel, stainless steel and other specialty ductile grinding mill for molding, cutting, and other precision grinding mill. Brown white mix: a brown, white fused alumina both worlds. For ductile iron by the shafts, axles and other parts of grinding with other grinding. Green silicon carbide: high hardness, brittleness, abrasive sharp, good thermal conductivity. For carbide cutting tools, artifacts and non-ferrous metals, non-metallic grinding. Black silicon carbide: high hardness, brittle, abrasive