Polymer Molding Inc.

Welcome to Polymer Molding, Inc. (PMI)—a leading U.S. manufacturer of high-quality plastic protective caps, plugs, and custom moldings. Since 1978, we have specialized in engineering dependable, cost-effective solutions designed to shield critical threaded fittings, tubing, and valves from contamination and shipping damage. Operating out of our ISO 9001:2015 certified facility in Erie, Pennsylvania, we choose to prioritize exceptional customer service, precision quality, and real value over sheer corporate size. Whether you require an immediate shipment from our massive inventory of standard products or a fully customized solution engineered by our in-house tooling and prototyping team, PMI provides a seamless, start-to-finish partnership you can depend on.