Discussion
Refractory raw materials are distinguished by their
Answer: D
Correct answer: ability to withstand high temperature without softening
Refractoriness is the defining property: the material must retain its strength and its shape at the working temperature of a furnace or kiln. That means a low content of fluxes - alkalis, iron, lime - and a high content of alumina, silica or magnesia. Refractory materials are neither cheap nor plastic, and nothing used in a furnace lining is soluble in water.
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