Average particle size(um)is 10 Specific surface area(m 2 / g)is 39 Bulk density(g / cm 3) is 1.00 Polymorphs is the six-part characteristics of Micro boron carbide micro boron carbide powder prepared by a special process method, high purity, small particle size, distribution, large surface area and high surface activity, bulk density, is a synthetic superhard quality materials, hardness only to ...