Most glass-contact refractory materials are damaged by liquid-phase erosion dominated by diffusion. Soda lime glass has a liquid temperature of up to about 1500 ° C. The glass temperature of other glasses than soda lime glass may be higher or lower depending on the required viscosity characteristics of the glass and the composition of the glass. The most important property of refractory material for all glass-contacting parts is resistance to corrosion. The two properties of refractory interface stability and the tendency to produce stones are almost equally important. Interfacial stability means that the refractory material is partially eroded However, the surface of the refractory material is still intact and will not fall off and the glass will be defective.