121. With increase in the porosity, thermal spalling resistance of fireclay brick
122. Use of higher percentage of lime for bonding silica bricks, reduces their
123. Ganister is a source of the
124. Faster rate of drying of moulded refractories results in high __________ of refractories.
125. Chrome magnesite bricks are used in the
126. Grog . . . . . . . .
127. Refractories used in/for __________ should have low thermal conductivity.
128. Panel test determines the __________ of refractories.
129. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm².
130. Si percentage in silica refractories used in the walls of coke oven is about
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