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Injection-Molded Plastic Parts

Known by our customers for our outstanding service and Midwest values, we have the knowledge and experience it takes to move a project from concept to launch on time and at a competitive price.

RPI is a custom injection molder of thermoplastic resins.

Welcome to Riverside Plastics, a family-owned and operated leader in the thermoplastic injection molding and tooling industry for more than 50 years. Known by our customers for our outstanding service and Midwest values, we have the knowledge and experience it takes to move a project from concept to launch on time and at a competitive price..

What's New at RPI

Thermoplastic Injection Molding

With injection molding machines (often called presses) ranging from 30 tons to 730 tons, we can produce parts which weigh anywhere from a fraction of an ounce to several pounds.

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Engineering / Design

Our engineering team will work closely with you to optimize part and tool design to assure efficient manufacturability and minimize the likelihood of costly delays and revisions.

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Tool & Die

Our toolroom has been operating alongside our molding operation for more than 40 years, so we have considerable insight into what it takes to produce a reliable tool that will withstand the test of time.

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Quality Control

We have a disciplined, yet flexible, quality system which allows us to focus resources where they are needed the most. We have a variety of inspection equipment and a willingness to work according to customer needs.

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Customer Service

We know that it is not about us. The greatest compliment we receive from our customers is that they rarely need to think of us due to our consistent quality, delivery, and performance.

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Post-Molding Machining

We are more than a "shoot-and-ship" molder. Besides molding, we can perform a variety of post-molding operations.

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