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Reaction Injection Molding

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One of the main differences between reaction injection molding and standard injection molding is the use of thermoset polymers, such as polyurethane, instead of thermoplastics. Read More…

Reaction Injection Molding Reaction injection molding (RIM) is a plastic molding process commonly used for larger (parts up to 8' x 8'), geometrically-complex parts, rigid foam parts and parts that have lower annual production runs (100-20,000).
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Leading Manufacturers

Cleveland, OH  |  440-238-3009

You won’t find better quality injection molded plastics anywhere else in the industry. We have built ourselves up from a small manufacturing company to a large company with decades of experience.

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GSH Industries, Inc. $$$

Shelby Township, MI  |  248-275-1978

If you are in need of injection molded plastic parts that are of consistent quality, look no further than MSI Mold! We have over 30 years of experience in design, production, and tooling of custom plastic parts.

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MSI Mold $$$

Stuart, FL  |  772-286-9278

We may have started small, but today, we offer our products and services to companies around the world. We are dedicated to our customers, and our goal is to offer better service and pricing to any customer no matter the size.

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Britech Industries $$$

Mountain, WI  |  715-276-4200

Nicolet Plastics is an injection molder that specializes in molding of complex parts from our two world-class facilities in Mountain, WI and Jackson, WI. We service our customers by offering solutions to all your molding needs including Carbon 3D printing and post molding / assembly. Our Mountain plant focuses on low to medium runs while our Jackson plant focuses on medium to high volume work. For over 30 years, we have achieved steady growth due to our fast, flexible team and great customer service.

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Nicolet Plastics $$$

Riverside, CA  |  951-354-0258

At R.M.Tool, we provide custom CNC Machining to help our customers solve some of their toughest machining needs. Our state-of-the-art CNC machining department is equipped with Milling, Turning and Wire EDM Machining Centers. We can process materials such as Steel, Stainless, Aluminum, and other Exotic Materials. We strive to always please our customers by always delivering quality products. From design to finished product, R.M.Tool is your one stop shop for all of your CNC machining needs.

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Hi-Rel Plastics & Molding $$$

Riverside, CA  |  951-509-6918

Call Molded Devices for a fast, competitive quote on plastic molding, plastic injection molding, and medical injection molding services. A wide range of standard & proprietary caps, covers & containers plus custom components for all your needs. We are your one-stop for design consult, quick prototyping, custom formulations & secondary operations!

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Molded Devices, Inc. $$$
placeholder image GSH Industries, Inc. MSI Mold Britech Industries Nicolet Plastics Hi-Rel Plastics & Molding Molded Devices, Inc.

The addition of a curing phase in the molding process makes reaction injection molding distinct from standard injection molding. The low viscosity of the material caused by the exothermic reaction of the two raw materials (isocyanate and polyol) and low injection pressures in the RIM process ensures long material travel paths, which is helpful in the production of large parts; elimination of built-in stresses, which is due to the reaction versus the pressure of injection; and exceptional durability of the finished part.

RIM is used in a host of industrial applications such as medical enclosures, automotive interior/exterior parts, telecommunications structures, laboratory and analytical housings, heavy equipment, agriculture, vehicle covers and various consumer goods. RIM is also used to make panels/covers for electronics, laboratory and analytical/scientific equipment, enclosures for medical devices, housings for computers and telecommunications equipment, ATM housings and a host of automotive components for the transportation industry.

RIM parts are sturdy, durable and resistant to aging and weathering, and so the reaction molding process is often used to produce molded plastic parts such as radar antennae, telephone system shields and automobile bumpers that are required to withstand impact and abuse. RIM is an economical option for manufacturing these parts due to low labor costs, minimal material waste, use of low cost aluminum tooling and various material options.

The process of reaction injection molding is named after the chemical reaction that takes place within the plastic in the injection, curing and cooling phases. Two liquid components - a polyol and an isocyanate component - are impinged upon each other at a mixhead and then injected (mostly by gravity) into a heated aluminum mold. These liquids chemically react - hence the term "reaction" injection molding - and then harden into the shape of the mold cavity.

A foaming action occurs between the two components as a result of this chemical reaction and forms a cell structure that then fills out the mold cavity. The chemistries of the polyol and isocyanate coupled with the mix ratios determine the physical properties of the final foam material and the type of polyurethane part manufactured.

The foam structure could be soft and flexible like a seat cushion, or it could be made to react and form with little foaming action to make a hard (solid), thin-walled foam to mimic the physical properties of an injection molded-type plastic such as a computer housing. The chemistries could be altered to allow for impact resistance as well as flexibility.

The versatility of RIM is another advantage to the process; there is no limit to the variety of products that can be manufactured by RIM. Reaction injection molds are cost-effective and allow for greater design flexibility, but they have a lower production rate than standard injection molding due to the cure time involved, the size of the parts and the slower cycle times involved in the process.

Advantages of RIM versus other low volume production methods are cost savings, part repeatability and consistency, weight savings, design freedom and overall part quality. Huge cost, weight and quality advantages can be reaped from RIM for operations that already use FRP (Fiberglass layup) as a production method.

Due to the control over wall thickness and dimensional/assembly features it allows, RIM will produce a better fit and finished assembly every time compared to other processes. RIM also makes it possible to have very large draws as well as various wall sections without sink or distortion. RIM engineers can design for both the aesthetic side of the part (side A) and the working side of the part (side B) and apply many more DFMA principles.

- Reaction injection molding information courtesy of THIEME Corporation

Reaction Injection Molding Informational Video