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Which of the following materials takes part in the removal of remnants wax from the mould?

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Which of the following materials takes part in the removal of remnants wax from the mould?

(a) Nitroglycerin

(b) Phosphoric acid

(c) Water

(d) Trichloro-ethylene

The question was asked during an online exam.

I'm obligated to ask this question of Precision Investment Casting in portion Special Casting Techniques of Casting-Forming-Welding I

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Correct option is (d) Trichloro-ethylene

Easy explanation: After the removal of wax by melting and inverting the mould, some particles of the wax still stucked at the inside corners of the mould, and removal of them is very necessary to have castings free from defects. So, hot vapours of trichloro-ethylene are dissolved with the wax remnants in the mould to remove the same.

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