· Carborundum stones are sharpening stones made from silicon carbide. This is a rigid material; it can sharpen every knife that you have. Taking a look at the Mohs scale, silicon carbide has a hardness score of Now that is hard! You may not realize it, but silicon carbide is all around us. Its hardness makes it a very useful material. Aside from sharpening stones, silicon carbide is also ...
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