... 4.5 × 107. White powder, tasteless, non-toxic. The relative density is 2.1-2.3, refractive index 1.37, glass transition temperature ... any acid (including aqua regia), alkali, grease, low coefficient of friction, wear resistance, and a self-lubricating. Excellent resistance to ... , good resistance to electric arc, without sticky, almost all of the sticky substance on its surface can not adhere completely ...