Reaction Injection Molding

RIM Molding Manufacturing


Request a Proposal

Upload your CAD files (Pro-E, SolidWorks, STP or IGES) along with your annual volumes, paint requirements and other project specific information and we’ll prepare an estimate for the cost and timing for the RIM tooling and part costs of your project.

Request a Proposal

Rim Application

There are many reasons to use RIM molding and engineering for your next enclosure, housing, cover or structural part. Reaction Injection Molding offers low annual volume production (200-20,000 per year), deep draws, large parts, multiple wall sections within the same part, and more.

Our Process

Our RIM Molding process is as unique and complete as the parts we make using reaction injection technology. With our 40 plus years of part and RIM tooling design for reaction injection parts, partnering with a top reaction injection molding company early in your concept/design phase of a plastic assembly can yield cost savings and manufacturing advantages well beyond simple part cost.

Project Gallery

Have a look inside our project gallery and see the wide array of industries that choose Thieme Corporation and the reaction injection molding RIM process to achieve success.

RIM Molding Services

RIM molding is a dynamic and efficient molding service used for unique, low annual volume applications. It differs from traditional injection molding and is capable of customizable parts in a cost-efficient manner. Reaction injection molding produces an array of durable, polyurethane products. 

Thieme is a reaction injection molding company offering custom reaction injection molding services. Our RIM tooling and molding services help connect businesses to affordable means of creating unique parts of various materials, weights, density, strengths, and hardness. 

The RIM Process

Traditional injection molding offers rather limited options. This is because conventional molding involves heating up a thermoplastic pellet, which is then injected under high pressure to fill a cavity. This method has limitations in terms of formulation possibilities, wall thickness variation, and size.

RIM Molding System Diagram

RIM is a process that involves injecting two liquid raw materials (polyol and isocyanate) separately into a heated mold cavity using only a small amount of pressure. The two liquids combine to create an exothermic reaction where they polymerize to form a molded part.

This RIM process can achieve a broad range of physical properties. Depending on the formulation and mix ratio’s of the two raw material components of the polyurethane, the finished parts can be foamed, a solid, dual density foam and can vary from being flexible to very rigid. In addition, parts can be very large in size, lightweight and also be able to vary wall sections within the same part without sink or distortion. This is due in part to the foaming process which enables less built in stress in the part to occur especially in large parts or parts with variable wall sections (up to 2”).


Advantages of Choosing Reaction Injection Molding

The RIM molding process holds an array of valuable benefits. Here are a few that our customers have found beneficial:

The reaction injection tooling molding process proves to be more cost-efficient than traditional means of molding, especially at low annual volumes of 5,000 parts or below. This is due to the use of cost-efficient polymer materials.

A reaction injection molding company like Thieme knows that reaction injection molding and engineering is an extremely versatile manufacturing process. This method allows for increased creativity since walls of differing thicknesses can be molded in the same part. Parts can be large in size or lightweight. The wall sections can also vary without sink or distortion. 

Due to the liquid injection RIM process and nature of the PUR foaming process, unique, difficult, deep drawn and cylindrical parts can be achieved.

Various Applications
Reaction injection molding is capable of fulfilling endless applications, from medical devices to automotive applications. reaction injection molding and tooling has been a solution for an array of sectors. Here are some of the common uses:

  • Medical device
  • Electronics
  • Laboratory and scientific devices
  • Kiosks
  • Petrol delivery
  • Casino devices
  • Financial and cash handling devices
  • Automotive
  • Heavy equipment and commercial vehicles
  • Structural Reaction Injection Molding

Trusted RIM Molding Services

Thieme is your trusted reaction injection molding company and partner for comprehensive reaction injection molding services. We are capable of fulfilling your needs, no matter your application or industry. We’ve served many customers in need of low annual production volumes that range from 200 units per year up to 5,000 units. 

Thieme offers affordable reaction injection molding tooling solutions for companies everywhere. Whether you’re looking for cost-efficient medical device cover production, heavy equipment console manufacturing, or recreational vehicle part production, Thieme is here to help. Our team of qualified engineers are here to guide you through any questions you may have. 

High Level Assembly

T hieme Corporation provides complete turnkey services for your device enclosure from concept to fulfillment, including reaction injection molding tooling, mold design, and structural RIM molding. We pride ourselves on our High level assembly (HLA) services which we supply assembly line ready components and assemblies to many of customers.

In addition to molding your device covers, structures, enclosures and housings we provide the following services:

  • Product Design Assistance
    • Medical device
      • Reaction injection molding feasibility studies
        • Tool Design and Manufacturing
          • Simulation and FEA Analysis
            • Prototype Development and Delivery
              • Production Molding Services
                • Painting and Surface Coatings
                  • EMI Shielding, HLA Services
                    • Value Added Assembly & Kitting
                      • Logistics & Packaging
                        • Product Fulfillment and Complete Project & Program Management

                        Request a RIM Design Guide

                        R equest a “Design for Reaction Injection Molding” Design Guide which highlights material selection, part design guidelines, molding in functional features and tooling considerations.
                        Request a RIM Design Guide