When functionalising fused alumina, a very thin layer of a silane adsorption group is applied to the fused alumina particles. This organic surface coating has the effect of better embedding and increased scratch resistance in a melamine resin matrix, for example. Fused alumina has a high refractive index (n = 1.76). “Greying” would occur in transparent coatings, such as varnishes and melamine resin, without additional coating. The coating adjusts the refractive index to that of the varnish, thereby improving the latter’s transparency.
What does the bulk weight indicate and what impacts the bulk weight?
According to the FEPA, the bulk density of an abrasive is the quotient of the mass and the volume a grain type poured out in a particular manner will occupy. The bulk density, also called bulk weight, is