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What is the softening point of western montmorillonite?

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What is the softening point of western montmorillonite?

(a) 800°F – 1150°F

(b) 1200°F – 1650°F

(c) 1750°F – 2100°F

(d) 2100°F – 2450°F

This question was addressed to me in semester exam.

This intriguing question comes from Molding Sands Binders in chapter Molding and Core Sands of Casting-Forming-Welding I

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The correct answer is (d) 2100°F – 2450°F

Explanation: Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite. Western bentonite also called as Sodium montmorillonite is known to have its softening point in the range of 2100°F – 2450°F.

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