... fine thermal stability. About JOHNCERA Ceramic CrucibleCorundum Crucible mainly used in ceramic chemical; and other industries ... chemical product fluorescence,electronic ceramic,semiconductor,aluminum hydroxid,alumina,magnesia and other productsCharacteristic:1. Corrosion,wear ... daily trends ceramics. Johncera has already largely developed Alumina, Zirconia, Silicon Carbon, Silicon Nitride and other ...