Refractory Technology
Refractory bricks having lower porosity have

Low thermal conductivity
High insulating properties
Greater strength
Low heat capacity

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Refractory Technology
Quartz is

All of these
Stable form of silica upto 870°C
Transformed to crystoballite on heating above 1470°C
Converted to tridymite on firing between 870 to 1470°C

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