The first commercial automotive application for Sorona EP biobased PTT polyester from DuPont Performance Polymers, Wilmington, Del., is in the interior of the Toyota Prius (alpha) hybrid car made in Japan. The part is an instrument-panel air-conditioning outlet. Sorona EP molds and performs similar to PBT, but offers lower warpage and improved surface quality, according to DuPont. Sorona EP is derived in part from fermented plant sugar. Its renewable content is 20% to 37%. Sorona EP has other commercial uses in electrical/electronic, industrial, and consumer products that might normally use PBT.