Discussion
A body intended for fast firing should have
Answer: D
Correct answer: few gas-evolving constituents and a wide firing range
A fast cycle gives little time for gases to escape or for the temperature to equalise, so carbonates, sulphates and organic matter must be minimised and the body must tolerate the temperature spread across the kiln. A wide firing range is what supplies that tolerance, which argues for alkaline earth fluxes rather than a heavy alkali content.
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