A. Stable form of silica upto 870°c B. Converted to tridymite on firing between 870 to 1470°c C. Transformed to cristobalite on heating above 1470°c D. All a., b. and c.
A. Poor resistance to the penetration of molten slag, metal & flue gases B. Poor heat conductivity & low strength C. Better thermal spalling resistance D. All a., b. and c.
