1) High temperature resistance 2)Good corrosion resistance 3) No drop broken bits, no tendency to craze 4)Long service life Name Item ... ,%5-85-85-8K2O,%1.51.72.10.200.20Fe2O31.81.81.81.21.0Na2O3,%0.50.50.50.100.10Bending resistant strength ... gas tunnel kiln, fuel tunnel kiln, rapid sintering shuttle kiln No deforming long service liferefractory sagger