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What is the percentage composition of quartz in Southern bentonite?(a) 5%(b) 10%(c) 15%(d) 20%I had been asked this question in final exam.The question is from Molding Sands Binders topic in portion Molding and Core Sands of Casting-Forming-Welding I

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Right answer is (C) 15%

The explanation: Bentonite is classified into 2 TYPES, namely, Sodium MONTMORILLONITE and Calcium montmorillonite.Southern bentonite also called as Calcium montmorillonite is KNOWN to have a percentage COMPOSITION 15% of quartz.



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