Seiler Plastics Corporation

Seiler Plastics Corporation is a leading U.S. manufacturer of custom plastic extrusions, injection molded components, plastic tubing, and extruded sheet products. Founded in 1971 and headquartered in St. Louis, Missouri, the family-owned company has more than 50 years of manufacturing experience, providing innovative plastic solutions to OEMs and industrial customers across a wide range of industries. With two manufacturing facilities and advanced engineering capabilities, Seiler Plastics delivers complete support from product design and material selection to tooling, prototyping, and full-scale production. The company's expertise includes custom plastic profiles, tubing, sheet extrusion, and precision injection molding using a wide variety of thermoplastic materials such as HDPE, LDPE, ABS, PVC, polypropylene, and butyrate. Backed by ISO 9001:2015 quality standards, in-house engineering, and value-added secondary operations including die cutting, printing, slitting, CNC routing, and light assembly, Seiler Plastics is committed to delivering high-quality, cost-effective manufacturing solutions with dependable lead times and exceptional customer service.