[caption id="attachment_565" align="aligncenter" width="300"] Polyester Fiber (Wikipedia Commons [PD]), from photo by Edward Dowlman, taken at Strathclyde University[/caption] Polyester Polyester, sometimes just called “poly,” is a long-chain polymer. According to the Federal Trade Commission, a polymer has to be at least 85% esters to be classified as polyester. There are several kinds of polyester, but the kind abbreviated PET is made into fabrics. PET is also the substance of...