PureTemp LLC is a biobased specialty chemical company with offices in Plymouth, Minn., and Tuscaloosa, Ala. PureTemp began producing the world’s first 100% renewable phase change material in 2007. These patented PCMs, developed in three years of research sponsored by the U.S. Department of Agriculture, are used in a wide variety of temperature-control applications, from cooling vests and warming blankets to refrigerators and thermal energy storage tanks. Derived from 100 percent sustainable sources such as animal fat and plant oil, PureTemp is nontoxic and biodegradable. It is engineered to maintain more than 200 different transition temperatures with consistent, repeatable performance.