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Materials that exhibit most of these properties are typically polymer-based, either polyurethane or epoxy.
The polymer is polyurethane , which is foamed to create closed cells.
Remember to polyurethane your creations after painting to protect them!
Insulation materials have also changed over the years from the original cork sheeting to the CFC-free, foamed in place rigid polyurethane used today.
Athletic shoes can contain several petrochemical polymers in their soles and uppers: butadiene, polyurethane , polyethylene, and nylon, to name a few.
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