Question

Which of the following is not used for the formation of the molding sand?

(a) Silica Sand

(b) Binders

(c) Additives

(d) Coal

I had been asked this question in an internship interview.

Enquiry is from Properties of Moulding Sand topic in section Pattern Materials & Moulding Sand Tests of Foundry and Forging

Answer 1

The correct option is (d) Coal

Explanation: The coal is a material which is not used in the formation of the molding sand as the particle size of the coal is high and there are chances that it will react with the possible gases that are produced during the pouring of the metal and result in casting defects.