Operational for over 65 years, Semco Plastic Company Inc. is one of the leading blow molders in the Midwest. Based in St. Louis, Mo., it owns a 400,000-square foot plant. The company manufactures an extensive line of custom injection and blow molded thermoplastic and thermoset products. Semco Plastic Company Inc. offers a wide array of products, including outdoor rocking chair, trash cans, umbrella stands, blaster plunger and purchase information. Its services include blow molding, injection molding, engineering and tooling. The company services many industries, including hardware, medical, electronics, appliances, automotive, and lawn and garden.