Assertion: silicon carbide's hardness | /r/HasProperty | 2670 – 2815 kg/mm
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text: mm³. Silicon carbide has a hardness of 9.5 Mohs, and the hardness of Knoop is 2670 – 2815 kg/mm, which is higher than that of corundum in abrasive materials, and second only to diamond, cubic boron nitride and boron carbide.