Colonial Engineering, Inc. has been in the custom injection-molding business for over 28 years. Our facilities in Portage and Benton Harbor, MI are ISO-9001 certified. Colonial specializes in PVC, CPVC, Noryl, PolyPro, PE, and is equally competent with many other materials. Press sizes range from 65 Ton to 2,000 ton. We also perform insert molding, post-molding CNC machining, tapping, decorating and sub-assembly. From design stage, through molding and secondary operations, you can look to Colonial for quality and dependability. We are centrally located between Chicago and Detroit near I-94, for competitive regional shipping.