Has a high chemical stability. CBN has a high antioxidant capacity, no oxidation at 1000 ℃, and iron-based materials in the 1200 ~ 1300 ℃ when no chemical reaction, but at about 1000 ℃ and water will produce hydrolysis, resulting in a large number of CBN is worn, so use PCBN tool wet cutting should pay attention to select the type of cutting fluid. Under normal circumstances, wet cutting on the PCBN tool life without significant improvement, so the use of PCBN tools are often used when the dry cut.