Silicon carbide commonly known as emery, chemical formula SiC, colorless crystal, containing impurities when blue black. The structure is similar to diamond, with each silicon atom surrounded by four carbon atoms and each carbon atom surrounded by four silicon atoms, forming "megamolecules". The hardness is second only to diamond, the density is 3.217 g/cm 3, and the melting point is about 2700 degree (decomposition sublimation). The chemical properties are stable, and it does not react with chlorine, oxygen, sulfur, and strong acids at high temperatures, but can react with bases.

1, compressive strength MPa 7d Greater than or equal to 60
28d Greater than or equal to 70
2, impact resistance MPa 7d Greater than or equal to 8
28d Greater than or equal to 9.5
3, Mohs strength Greater than or equal to 8
4, wear-resistant quality loss mg 1000R/500g Less than or equal to 3000