First, the strength of the abrasive means the solidity of the silicon carbide particles themselves. That is, when the abrasive blade edge is still quite sharp, can withstand the pressure without the ability to be stripped. Practice shows that the poor strength of abrasive, abrasive grinding its fast, low cutting capacity, short service life. This is to seek abrasive particles in addition to having a higher hardness, but also should have sufficient strength, in order to better grinding. The strength of the abrasive will have a direct impact on the amount of abrasive particles and the amount of working time required to maintain the highest cutting power. Therefore, the abrasive strength is one of the basic characteristics of abrasive.

         The strength of the abrasive is tested under a static load using a grit-abrasive method by placing 5 g of the abrasive grain sample on the surface of a cylindrical disc, placing another cylindrical disc, and pressurizing to 30 kg / Cm ², the crushed part of the sieve to see the rest of the unbroken part of the weight and total weight ratio to determine the greater the ratio, the greater the strength of the abrasive, on the contrary, the strength of the abrasive is small .