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What is the percentage composition of clay in natural sand?(a) 22-31%(b) 3-10%(c) 5-20%(d) 18-29%This question was addressed to me in examination.I'd like to ask this question from Molding Sands in section Molding and Core Sands of Casting-Forming-Welding I

Answer» RIGHT CHOICE is (c) 5-20%

Easy explanation: In natural sands, the PERCENTAGE COMPOSITION of clay is APPROXIMATELY 5-20% as the binding material. If the percentage composition is less than that like 3 to 10%, then the binding action will not take place effectively.


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