A is the most widely known abrasive powder, popularly known as Arundum.
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C is a black silicon carbide lapping powder commonly known as Carborundum.
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GC (green silicon carbide) is a very high-purity silicon carbide (SiC) lapping powder produced by reacting silica and coke in an electric furnace at a temperature greater than 2000 C.
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PWA is a white calcined alumina abrasive powder consisting of plate-shaped crystals of aluminum oxide (Al2O3) with a purity of over 99.0%.
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WA is a fused white alumina abrasive powder produced by crushing fused alumina and sorting the particles into a uniform size.
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