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Which of the following gases is not used in the cold-box process?

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in Foundry and Forging by (110k points)
Which of the following gases is not used in the cold-box process?

(a) Amine gas

(b) Sulphur-di-oxide

(c) Carbon-di-oxide

(d) Marsh Gas

This question was addressed to me in a job interview.

Origin of the question is Binders used in Making Cores topic in section Sand Moulding of Foundry and Forging

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Best answer
The correct choice is (d) Marsh Gas

To elaborate: Amine gas and sulphur-di-oxide gases are used at high temperatures where the core boxes are made of wood and plastic. The carbon-di-oxide gas is used as a casting core binder in sodium silicate. Marsh gas does not find any applications in the cold-box process.

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