Silica bricks have low spalling resistance below 600°C, due to its________________?
Correct answer: A. High co-efficient of expansion upto this temperature
- A. High co-efficient of expansion upto this temperature
- B. Very high thermal conductivity
- C. High thermal diffusivity
- D. Low refractoriness
Explanation
Silica undergoes marked thermal expansion and structural changes below about 600°C, producing internal stresses and poor spalling resistance. Its high expansion coefficient in this range is the relevant cause, not low refractoriness.
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