When incinerating with molten salts at 1,100°C, refractory life can be impacted significantly by the type of refractory used. At this temperature, salts can vaporize, penetrate the refractory structure and condense behind the surface. Eventually, this can cause the refractory to spill, causing significant damage. Proper refractory selection is necessary when operating at these high temperatures with molten salt. In incinerators, generally speaking, flue gas velocities have very little impact on refractory erosion.