Question

If mercury is used as a pattern material in place of wax, then for the preparation of mould, mercury is kept at temperature_____

(a) below -38 ⁰C

(b) 0 ⁰C

(c) 0 to 38 ⁰C

(d) -38 to 0 ⁰C

The question was posed to me in exam.

I would like to ask this question from Precision Investment Casting in chapter Special Casting Techniques of Casting-Forming-Welding I

Answer 1

The correct answer is (a) below -38 ⁰C

To explain I would say: If mercury is used as a pattern material in place of wax, then the process is known as mercast, the mercury is kept under -57 ⁰C where the mercury is frozen. And the complete mould preparation is to be undertaken at a temperature below -38 ⁰C to keep the mercury in solid state.