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-ethyleneThe 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

Which of the following materials takes part in the removal of remnants

1.	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-ethyleneThe 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
Answer» 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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