... world's hardest industrial materials , it is not only having high hardness, stong wear -resistant, good thermal stability and other ... hardness value 90Gpa;Color: white, yellow, yellow-green, black, amber;Density: 3.52g/cm3;Heat resistance: 760 ° C did not change ... air;others: react with the iron group elements at high temperature.3.Application:Synthetic diamond powder were mainly used for ...