Which of the following is not the function of coating of refractory materials on the mould?

Which of the following is not the function of coating of refractory materials on the mould? Correct Answer Increase the heat transfer rate

The moulds are coated with a refractory material to increase the mould life by preventing the soldering of metal to the mould, by controlling the direction and rate of the casting solidification and also by minimizing the thermal shock to the moulding material. Coatings can be a mixture of sodium silicate, clay, soap, stone, talc etc.
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