Discussion
Talc is used as a flux in some bodies and supplies
Answer: D
Correct answer: magnesia to the composition
Talc is a hydrated magnesium silicate, so what it brings to a body is magnesia. In a wall tile it acts as a flux and gives a low thermal expansion; in a cordierite body it is the essential magnesia source. It supplies no plasticity and no alumina, and its iron content is a contaminant to be minimised rather than a purpose.
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