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What is the actual chemical used for plastic to bond when melting it back down? Answered

  I have seen the instructable where cooking oil was used.  I was wondering what the actual chemical is that makes it bond together again.
  Thanks

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jtobakoBest Answer (author)2010-03-10

The oil is used as a heat conductor and, to some extent, a solvent.  The plastic melts but can't burn because the oil is in the way.  The 'bonding' is just the plastic molecules getting close enough to stick.

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lemonie (author)2010-03-10

Molten plastic is a viscous liquid. Like molten lard, if you combine quantities you get a bigger lump when it sets - not a bonding/glue process.

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