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Which of the following is used as the pattern material in precision investment casting?

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Which of the following is used as the pattern material in precision investment casting?

(a) Metal

(b) Molten wax

(c) Plastic

(d) Wood

This question was addressed to me at a job interview.

Asked question is from Precision Investment Casting in chapter Special Casting Techniques of Casting-Forming-Welding I

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Correct option is (b) Molten wax

To elaborate: An expendable pattern, around which the mould is prepared. For the preparation of the pattern for every casting to be made, molten wax is used as the pattern material, which is injected under pressure of about 2.5 MPa into a metallic die, which has the cavity of the casting to be made. After the solidification of wax, it would produce the pattern.

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