Advancing American Glove Manufacturing for 60 Years. American Performance Polymers (APP), manufacturing subsidiary of Renco Corporation, is committed to advancing safety and security through the development of nitrile glove products and contamination control systems. Based on its legacy of leadership and quality, Renco/APP has received funding under the Defense Production Act. It is our mission to produce billions of nitrile gloves and create hundreds of well-paying industrial and technical positions. Proudly USA Made.