Non Metallic Components | IGM Massachusetts, MA, Plastic washers, Rubber Washers, Neoprene Washers, Nylon Washers, Gaskets, Insulators, Washers, Discs, Die cutting, Plastic stamped components, Plastic stampings, Plastic machining, Custom Gaskets, Custom Die Cutting, Non-metallic gaskets, Seals IG Marston Co. is a large manufacturer of non-metallic Plastic & Rubber stamped components including custom made washers, gaskets, seals, spacers, disks, Insulators & tags.