SEPASIL®
Fused Alumina
SEPASIL® is a synthetic fused alumina, also called corrundum. Typical properties imparted are high transparency and an extremely high level of hardness (only diamonds being harder on the Mohs scale). For this reason it is commonly used in abrasion resistant coatings and lacquers.
Various particle size grades are available, ready for use. This saves the customer needing to mill them which can be problematic due to the high level of hardness. Each grade is then available with an optional silane surface treatment to faciliate dispersion and cross-linking into the particular binder or polymer that the products is being used in.
Due to its high level of electrical insulation you will also commonly find it being used in cast resin insulators and high-voltage insulators.