Polycrystalline corundum is based on black corundum, adding new elements in the production process, optimizing the main crystal image of black corundum, its color is brown-black, with high hardness, strong toughness, and good self-sharpness. Polycrystalline corundum retains the advantages of black corundum with good self-sharpness, high sharpness, less heat generation, and high surface finish, which greatly improves the durability of black corundum.
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