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Polyformaldehyde has a good stability up to _____

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Polyformaldehyde has a good stability up to _____

(a) 50^oC

(b) 100^oC

(c) 150^oC

(d) 250^oC

I had been asked this question during an interview.

The query 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 (c) 150^oC

For explanation I would say: Polyformaldehydes are a combination of phenol and formaldehyde. They are also known as phenol formaldehyde. They are hard and rigid materials and are stable up to 150^oC. They also possess good electrical insulation, low thermal conductivity, and are relatively cheap.

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