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Which of the following is not an example of a thermoplastic polymer?

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Which of the following is not an example of a thermoplastic polymer?

(a) Urethane

(b) Melamine

(c) Epoxide

(d) Acetal

I have been asked this question in final exam.

The question is from Thermosetting Plastics, Particle Reinforced Composites topic in chapter Non Metallic Materials of Engineering Material & Metallurgy

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The correct choice is (d) Acetal

To explain: Urethane, Melamine, and Epoxide are common examples of thermosetting engineering plastics. They have higher strength, are more costly, and possess better physical properties than commodity plastics. Acetal is an example of thermoplastic engineering material.

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