RTP Company, headquartered in Winona, Minn., is a global compounder of custom engineered thermoplastics. The company has over ... 20 manufacturing plants located in the United States, Mexico, Europe, Singapore and China. RTP Company’s engineers develop customized thermoplastic compounds in over 60 different engineering resin systems for applications requiring color, conductive, elastomeric, flame retardant, high temperature, structural, and wear-resistant properties. read more