Refractory bricks with lower permeability is produced by using __________________?
Correct answer: D. All A., B. and C.
- A. Higher firing temperature
- B. Higher moulding pressure
- C. Finer grog size
- D. All A., B. and C.
Explanation
Permeability is reduced by densifying the brick and reducing pore size, achieved through higher moulding pressure, finer grog and higher firing temperature. Therefore all three listed methods contribute.
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