Question

In the molding sands, which of the following are the major properties?

(a) Permeability

(b) Sand Grains

(c) Size of the grains

(d) Permeability, sand grains and size of the grains

This question was addressed to me in an interview.

This intriguing question comes from Types of Sand Moulds in portion Pattern Materials & Moulding Sand Tests of Foundry and Forging

Answer 1

The correct answer is (d) Permeability, sand grains and size of the grains

The best explanation: The shape and size of the sand grain would greatly affect the various molding sand properties. The sand grain size and the sand grain could be coarse or fine and the grain shape should be round or angular. The sand permeability should depend on the type of casting to be manufactures. All these properties make a sand quality optimum.