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RIM Manufacturing

“The reaction makes all the difference”
The most advanced custom Reaction Injection Molding company.

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RIM Process

RIM Manufacturing – The Way We Work Gets a Very Positive Reaction

With RIM Manufacturing, you get positive reactions from customers, end users, and people who care about your bottom line. You can achieve significant advantages over injection molding, vacuum-forming, pressure-forming, and cast molding in design, flexibility, and cost-efficiency, as well as wide ranges of part sizes, design uniqueness, and overall superiority.

Every member of RIM Manufacturing is committed to ensuring the success of your part’s design throughout every phase of the Reaction Injection Molding (RIM) production process. We are dedicated to supporting your project from part and DFM design to mold design, manufacturing, part production, secondary processing, painting, assembly, quality consistency, custom packaging, shipping, and outstanding customer service.

Reaction Injection Molding – the Reaction Makes All the Difference

RIM combines low-viscosity liquid polymers (resins and catalysts) to generate a thermochemical reaction whereby the polymers expand, thicken, and harden, producing a thermoset polyurethane part.

Thermoset plastic parts are generally stronger due to “cross-linking” – a three-dimensional network of bonds. Parts keep shape as the covalent bonds between the polymer chains cannot be easily broken. The result easily produces large, lightweight parts that hold tight tolerances, balance strength, and toughness and are highly heat and chemical-resistant. RIM molded parts, unlike injection molded parts, cannot be melted or easily reshaped after curing.

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Greater Product Design and Flexibility with RIM Molding

Reaction Injection Molding (RIM) allows for design options otherwise impossible. It accommodates small to very large parts, structural integrity, tight tolerances, and varied wall thickness ranges within the same part. Plus, the RIM process accommodates over-molding, which allows several parts to be combined into one.

Design solid, elastomeric, structural foam, or flexible foam parts with your precise characteristics of impact resistance, dimensional stability and strength, wear- and corrosion resistance, 94V-0 and HB ratings, thermal insulation, and more.

A 360 View of RIM Products & Parts

Imagine the Reaction When Your Parts Perform Better and Cost Less

Our aluminum molds typically cost 50-70% less than steel molds. And they last longer since they are used at lower pressures and temperatures. They may never need to be replaced and can be modified less expensively.

Lead time to production is also considerably less, reducing your time to achieve profitability. Our parts costs are very competitive with other polyurethane processes and almost always less expensive for parts that are large or have high demands for structural integrity, unusual or complex geometry, and design tolerances. Over-molding and combining several parts into one can bring about further cost savings. When cost savings are combined with production advantages, you get a very positive reaction.

The ability of RIM Manufacturing to quickly understand our needs and to collaborate on a solution has resulted in a relationship that makes RIM Manufacturing our go-to partner for this type of technology

Rick Payne

Sr. Dir., Design and Engineering, Flex

Our first two projects together (Abbott Molecular and Therox) posed plenty of size and shape challenges and the end results are something we can all be proud of. We’re looking forward to our next collaboration and deeply value our relationship.

Earl Robinson

President, Omnica Corporation

Abbott Labs – DNA Analyzer

Laser Device

Ice Dispenser

Kid’s Booster Seat

Carrier Jacket

Tractor Hood

Electrostatic Spray System

Mud Can

Ophthalmic Device

Lighting Board

The Right Chemistry from the Right Reaction Injection Molding Company

RIM Manufacturing offers the broadest selection of polyurethane two-component chemical systems to match your needs perfectly. We are industry experts who constantly strive to improve our Reaction Injection Molding processes by contributing significant design knowledge and proficiency.

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RIM’s Part and Design for Manufacturing (DFM) Process

The RIM Process and Capabilities

  1. Thermosets vs. Other processes
  2. Are we a fit

Material Selection (RIM Chemical Systems)

  1. Purpose of the part
  2. Shore hardness, tensile strength, flex modulus, and fire retardancy

Design For Manufacturing (the Part)

  1. Functionality, durability, and part weight
  2. Wall thickness, ribbing, bosses, and inserts
  3. Fire retardancy

Tool Design (the Mold)

  1. Draft and undercuts
  2. Gating, venting, and parting lines
  3. Cooling fixtures

Cosmetic Criteria and Inspection Requirements

  1. Work Instructions / Quality Checklists
  2. Paint And Silk Screening

Packaging and Shipping

  1. Protective Coverings
  2. Custom Packaging

About RIM Manufacturing

Since 1979, RIM Manufacturing has evolved into the largest independent “custom” reaction injection molding company in the U.S., producing parts that include structural foam, rigid RIM, elastomeric, flexible foam, self-skinning foam, and “virtually indestructible” DCPD (Dicyclopentadiene).

Recognized as an industry expert, we are ISO 9001 and 13485 certified and operate eight (8) multi-functional RIM dispensing machines and thirteen (13) hydraulic presses used to produce polyurethane parts that are as diverse as our customers, which include some of the largest S&P 500 companies, global contract manufacturers, and multinational conglomerates.

Over the past 50 years, we have developed a customer-centered philosophy dedicated to meeting our customers’ needs through production consistency, product quality, competitive pricing, on-time delivery, and unmatched customer service. Our advantages uniquely position us as a partner to help accelerate our customers’ success.
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