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Which of the following lubricants is added to the resin sand mixture for better flowability of the sand?

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Which of the following lubricants is added to the resin sand mixture for better flowability of the sand?

(a) Lead stearate

(b) Magnesium stearate

(c) Sulphur stearate

(d) Zinc stearate

This question was posed to me in an interview for internship.

Question is taken from Shell Moulding topic in portion Special Casting Techniques of Casting-Forming-Welding I

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Correct choice is (d) Zinc stearate

Easy explanation: Some lubricants such as zinc stearate and calcium stearate are added to the resin sand mixture to improve the flowability of the sand, which helps in covering of maximum part of the metallic pattern efficiently and also permit easy release of the shell from the pattern.

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