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Acetals retain their properties up to ______

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Acetals retain their properties up to ______

(a) 50^oC

(b) 120^oC

(c) 240^oC

(d) 420^oC

This question was addressed to me during an online interview.

This interesting question is from Thermoplastics topic in portion Non Metallic Materials of Engineering Material & Metallurgy

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Correct answer is (b) 120^oC

Explanation: An acetal is a product of polymerization of formaldehyde. They have a low coefficient of friction, good strength, and can retain its properties up to 120^oC. They are also known as polyacetal and polyoxymethylene.

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