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Does anybody know the softening temperature of styrofoam (expanded polystyrene)?

By styrofoam I mean the solid made of expanded polystyrene balls used in packaging.

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There are a number of different temperatures one could consider the softening point of atactic (randomly distributed phenyl groups) polystyrene, used in making expanded polystyrene :

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  • $\begingroup$ Not to mention softening point is effected on thermal history and residual stress. $\endgroup$
    – A.K.
    Jul 17 '18 at 2:40
  • $\begingroup$ And chemical composition (phenyl distribution etc.) $\endgroup$ Jul 17 '18 at 2:55

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