Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?
Correct answer: D. 30
- A. 10
- B. 15
- C. 20
- D. 30
Explanation
During firing, removal of chemically combined water, volatile matter, and pore-forming constituents can produce substantial volume contraction. For some refractory mixes, the maximum shrinkage may approach 30%.
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