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Black silicon carbide grinding wheel is made of first grade sand, hard-wearing silicon carbide and binder at high temperature sintered, It is also called ceramic grinding wheel, wear-resistant, durable, strong toughness (Poor grinding wheel is reclaimed sand). It is high hardness, high brittleness, sharp abrasive grains and good thermal conductivity.link:https://www.renwa-abrasive.com/vitrified-grinding-wheel/black-silicon-carbide-grinding-wheel.html