... 2. purity: 99%, >=99.5% 3. hexagonal and spherical 4.lubricants additive Particle Size80-100nm, 800nm, 1-15umPurity99%, >=99.5%ApplicationBoron ... of good lubricating property, it is used as high-temperature lubricants and various models'deoxidizer.Mould pressing boron nitride can be ...