Vitrified Bond is a bonding Vitrified bond wheels are extremely aggressive and free cutting at low temperature. It is the most popular bonding for traditional abrasive grinding wheels, and as to superabrasive grinding wheels, it is an extremely high stock removing rates and extremely high wheel life. If you're precision grinding and finishing Superabrasive (PCD CBN PCBN), steel or carbides, or grinding on extremely hard materials, or pursuing a high stock removing rates, you need a durable wheel that will withstand high grinding forces and perform well in offhand finishing applications, RZ vitrified bond grinding wheels will give you what you want.