A. Less shrinkage in heating, decreased apparent porosity & increased specific gravity B. High strength & thermal spalling resistance C. Less addition of water to get a workable plasticity & lesser time required for drying the raw RefRactories and hence increased rate of production
A. Have better spalling resistance than chrome magnesite refractories B. Have very low thermal co-efficient of expansion C. Are not at all resistant to the corrosive action of iron oxide D. Have very low (50 kg/cm2) cold crushing strength (c.c.s.), and cannot be used in metalcase
A. Has high fusion temperature (> 3000°c) but poor resistance to thermal shock B. Has high resistance to basic slags C. Which is expensive & radioactive, is used in crucibles for melting high purity metals D. All a., b. and c.
