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Three of the following are thermoplastics. Which is the odd one out?

  • A.polypropylene mouldings
  • B.expanded polystyrene foam
  • C.phenol formaldehyde resin
  • D.polyethylene sheeting

Answer: C

Phenol formaldehyde is a thermoset that cures to a crosslinked network. The other three all soften on heating and can be recycled by remelting. Curing produces a network that spans the whole article. Only the first three can be remelted.

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