Alumina ceramic is the most widely applied technical ceramic, which has high hardness and mechanical strength good wear resistance high temperature resistance, good electrical insulation and good resistance to corrison etc.more...
Hard of unifrom colour, free from all vegetable and mineral staisns , cracks buckles and other similar defeects and foreign inclusion , except that may be slightly wavy and may contain slight air inclusion in not more than on e - half of the usable area .crystallographic discoloumore...