Refractories are required to withstand high temperature. That is to say, they should not fuse or soften at high temperature, nor fracture with changes of temperature. Generally the softening temperature of refractories is well above 1500 c.

• 耐火材料必须耐高温，也就是说，在高温下不熔化或软化，在温度变化时也不破裂。耐火材料的软化温度一般都大大高于1500℃。