Which material is NOT a thermoplastic?

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Multiple Choice

Which material is NOT a thermoplastic?

Explanation:
Think about how plastics respond to heat. Thermoplastics soften and can be reshaped when heated, and they melt again if reheated. Bakelite, however, is a thermosetting resin that forms a highly crosslinked network during curing, so it does not melt—heating it instead causes it to char or decompose. Nylon, polypropylene, and polyethylene are all thermoplastics: they soften and can be remolded when heated. So the material that is not a thermoplastic is Bakelite.

Think about how plastics respond to heat. Thermoplastics soften and can be reshaped when heated, and they melt again if reheated. Bakelite, however, is a thermosetting resin that forms a highly crosslinked network during curing, so it does not melt—heating it instead causes it to char or decompose. Nylon, polypropylene, and polyethylene are all thermoplastics: they soften and can be remolded when heated. So the material that is not a thermoplastic is Bakelite.

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