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Which type of sand is used in shell moulding?

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in Casting-Forming-Welding I by (687k points)
Which type of sand is used in shell moulding?

(a) Black sand

(b) Wet and fine sand

(c) Dry and fine sand

(d) Any of the sand

This question was addressed to me in quiz.

My enquiry is from Special Casting Techniques in division Special Casting Techniques of Casting-Forming-Welding I

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Correct option is (c) Dry and fine sand

The explanation: Dry and fine sans is used in shell moulding. It is completely free if clay (90-140 GFN).

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