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Which refractory sand has the best moulding material?

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Which refractory sand has the best moulding material?

(a) Silica sand

(b) Magnesite

(c) Zircon

(d) Olivine

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I want to ask this question from Refractory Sands topic in portion Molding and Core Sands of Casting-Forming-Welding I

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The correct answer is (a) Silica sand

Explanation: Silica sands are considered to be having the best moulding material. It has its occurrence in a variety of crystalline modifications.

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