This page was written by Steven J. DeRose on 2003-03-30, and was last updated on 2003-03-30.
There is good comparative infomration on polymers (basically, plastics) at the Engineering Fundamentals website, including details specs on many, many polymers. Sadly, you need to become a member to get much information.
A nice table with many properties for a fair number of plastics can be found here; their home page is here and provides information and sales for other materials too.
They note that plastics typically don't have a true "melting" point. Rather, they have a "glass transition temperature", at which their properties change radically: for example, the material goes from glassy to rubbery.
Crystalline materials commonly have a leathery stage in between.
Thermoplastics soften when heated; but thermoset plastics decompose instead; some decompose into toxic materials.
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