Hardness evaluates a cloth's potential to resist mechanical dress in and abrasion. Alumina ceramics surpass metal and tungsten carbide applications in hardness. Around the Rockwell hardness scale, alumina ceramics range between HRA80-90, placing them just under diamonds and over chrome steel. Iolite ceramics are suitable square mirror products for lithography https://paull765fxo5.scrappingwiki.com/user