A CDE Definition
A polymer material that becomes pliable with heat, and with sufficient temperature, a liquid. When cooled, thermoplastics return to solid. There are more than 40 types, including acrylic, polypropylene, polycarbonate and polyethylene. Dating back to the mid-1800s, celluloid was the first thermoplastic, which remained popular until the mid-1900s. See thermoset and 3D printing.
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