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Which of the following materials is mostly used for making of thermoforming moulds?

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in Casting-Forming-Welding II by (119k points)
Which of the following materials is mostly used for making of thermoforming moulds?

(a) Steel

(b) Grey cast iron

(c) Aluminium

(d) White cast iron

The question was asked during an online exam.

This question is from Blow Moulding and Thermoforming in chapter Moulding with Polymers of Casting-Forming-Welding II

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Correct answer is (c) Aluminium

To explain: Thermoforming moulds are always made of aluminum because of its light weight, machine ability, and good thermal conductivity. Aluminum moulds may also contain passages through which water can be pumped for cooling of components, which may greatly affect the shrinkage and other features of the components made.

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