The series products are made of different grades of sintered magnesia or fused magnesia .The higher content of MgO and sintering temperature, the higher direct bonding degree of MgO in the products, and its high temperature performance and anti-erosion performance is better.This series of products are widely used in the permanent lining of steel furnace, lime kiln, glass kiln regenerator, ferroalloy furnace, mixed iron furnace, non-ferrous metallurgical furnace and so on.