Reaction Injection Molding

Find reaction injection molding services and RIM molding from reaction injection molding companies. Use the time-saving Request for Quote tool to submit your inquiry to all the reaction injection molders you select.

For injection plastic molding, Prototype & Plastic Mold Company offers precision plastic injection molding with a focus on difficult to mold items. Since 1968, we have evolved into a preferred supplier of injection molded products. A short - medium run molder, our molding machines can mold from a choice of plastic resins. Techniques include insert molding, overmolding, & plastic injection molding.
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Bruin Manufacturing
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Marshalltown, IA
641-752-7116
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Bruin Manufacturing, an ISO 9001:2000 certified molded plastic manufacturer, provides plastic injection molding with quality parts, fast turnaround & cost savings due to high efficiency. We have a wide range of in-house custom small hot runner plastic molder capabilities with sizes to 1/1000 of an inch, from piecework to total turnkey. Whether a large or small customer, Bruin can work with you!
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As one of the premier injection molding plastics facility, MIE offers specialized insert molding at its ISO/TS 16949 certified plastic manufacturing company. If you require a cost effective plastic critical safety component, MIE exceeds expectations with design through high volume production. Since 1985 we have served electronics, automotive, medical, & telecommunications industries.
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Injection molding facility, Mid-America Plastic Company, was established in 1968 to offer custom plastic molding at its ISO 9002 quality registered facility. With injection and insert molding specialties, we offer simple to complex plastic products from a choice of plastic materials. Examples of our products produced include automotive switches, lenses, bearings, valves, gears and actuators.
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Industry Information

Reaction Injection Molding

The Reaction injection molding (RIM) process is an economical option commonly used for larger, more complex polyurethane plastic and rigid foam parts produced in small quantity. RIM is used in a number of commercial and industrial applications, and is employed for the production of parts such as panels for electrical equipment, enclosures for medical devices, housings for computer and telecommunications equipment, and in the automotive industry. RIM is often used to produce larger parts because of low viscosity and low injection pressures.  RIM parts are sturdy, durable and are resistant to aging and weathering. The RIM process is used to make parts such as shields for telephone systems, radar antennas and automobile bumpers.

Instead of using thermoplastics, the main difference between RIM and standard injection molding is the use of thermoset polymers, specifically polyurethane.  Reaction injection molding is named after the chemical reaction that takes place within the plastic.  Two liquid components-a polyisocyanate component and a resin mixture-are injected into a mold, chemically react and then dry, all within 60 seconds.  During the chemical reaction, foaming occurs, forming bubbles which become open or closed cell foam.  Because there are so many different design choices when using RIM, the look may vary considerably.  The finished product can be solid and hard, a foam or elastomeric like rubber.  RIM is useful in the production of parts that need a cosmetic appearance, such as computer covers.  They are low costing molds and have allow for greater design flexibility, but have a lower production rate than standard injection molding.