Specialty Plastics Inc. is a custom plastic injection molder located in St. Peters, MO, just west of St. Louis, MO. Our core competency is tight tolerance plastic parts. For 30 years, we have supplied high quality injection molded products and services to a wide array of business: automotive, healthcare, home appliances, sporting goods, medical instruments, electrical and many more. Injection molding is our specialty.

At Specialty Plastics, we consider business a partnership with our customers. We cannot continue to grow unless our customers do so. Let us show you the benefits you’ll gain with a partnership with us. Specialty Plastics – for all your plastic molding needs!
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As a custom injection molder, we have the technology and machinery to provide a wide range of services to our customers. With 21 state of the art injection molding machines and over 35,000 sq. ft. of manufacturing space, we can mold parts ranging from 3 oz. shots (35 ton press) to a 55 oz. shot (400 ton press). Besides standard plastic injection molding, we also perform thermoset molding, insert molding and over molding. All of our machines have robotics for easy part removal and labor savings.
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In addition to injection molding, we also offer blow molding services. Whether you need a bellows design, plastic bottle design or other blow molded design, we have the capability to blow mold your plastic part application.






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Not only do we make high quality, tight tolerance injection moldings, Specialty Plastics offers several value added services, not offered by other injection molders. We offer: hot stamping, pad printing, sonic welding, milling, drilling, assembly work, special packaging, etc. If you’re not sure we do it, just ask. We are your full service plastic injection molder.



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