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The sodium bentonite binder imparts swelling properties to the molding sand.

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+1 vote
in Foundry and Forging by (110k points)
The sodium bentonite binder imparts swelling properties to the molding sand.

(a) True

(b) False

I had been asked this question in final exam.

This is a very interesting question from Moulding Sand Binders and Additives in section Pattern Materials & Moulding Sand Tests of Foundry and Forging

1 Answer

+1 vote
by (736k points)
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Best answer
Right choice is (a) True

To explain: Sodium Bentonite provides better swelling properties- volume increases some 10 to 20 times, high dry strength which lowers the risk of erosion, better tolerance of variations in water content, low green strength and high resistance to burnout, which reduces clay consumption.

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