Northern Technologies International Corp. engages in the development and market of proprietary environmentally beneficial products and technical services. It operates through the Natur-Tec and Zerust segments. The Natur-Tec segment manufactures bio-degradable and bio-based plastics for industrial and consumer applications. The Zerust segment provides corrosion mitigation solutions and services to oil, gas and chemical processing applications. The company was founded in 1970 and is headquartered in Circle Pines, MN.