Reaction Injection Molding (RIM) Services

What is Reaction Injection Molding (RIM) ?

  • Reaction Injection Molding (RIM) is a liquid-to-solid polymer molding process.
  • These two components are mixed and injected into a heated mold under pressure. They undergo a chemical reaction called exothermic reaction which may include degassing or foaming.
  • The mixture then solidifies within the mold to form a rigid or flexible polyurethane product.

Reaction Injection Molding (RIM) process

RIM is a versatile manufacturing process that combines the advantages of liquid casting and injection molding. It involves mixing two reactive liquid components, typically a polyurethane resin and an isocyanate, within a closed mold. The mixture quickly expands and cures, forming a solid, durable part with exceptional physical properties.

The step-by-step overview of the reaction injection molding process is

Step:1 – The two main components of the reaction injection molding process, polyol and isocyanate, are stored in separate tanks. The polyol is a blend of polyol resin, surfactants, catalysts, and blowing agents. The isocyanate is a reactive liquid that acts as the hardener.

Step:2 – The polyol and isocyanate are metered precisely by pumps to ensure the correct ratio of them. The metered polyol and isocyanate are then mixed together in a high-pressure mixing head. The mixing head impinges the two streams together at high velocity. This creates a turbulent flow that promotes rapid and thorough mixing.

Step:3 – The mixed components are injected into a heated mold under low pressure. The mold is made of two halves that are clamped together to form a closed cavity.

Step:4 – The polyol and isocyanate undergo exothermic reaction within the mold to form a polymer, called polyurethane polymer. The heat released from the reaction helps to cure the polymer and solidify the part.

Step:5 – After curing the mold is opened and the final part is ejected. The part is then allowed to cool further. Depending on the specific application, there may be additional steps involved in the reaction injection molding process, such as reinforcement, filling or skinning. Thus these are the processes involved in Reaction Injection Molding.

Topgrid’s Reaction Injection Molding (RIM) Service

  • Topgrid’s Reaction Injection Molding (RIM) Service is a high-volume, low-cost manufacturing process that is ideal for producing complex, high-quality parts.
  • Topgrid’s RIM service is a valuable asset for any company that needs to produce high-quality, complex parts at a low cost.

Our Expertise

With years of Experience in the industry, Our Team of experts excels in delivering
High Quality Reaction Injection Molding (RIM)

Topgrid’s Reaction Injection Molding (RIM) services are ideal for a wide range of products, including Aerospace, Electronics, Automotive and Medical Device. Our dedication to staying at the forefront of technology and industry trends ensures that we can meet the unique requirements of each project, no matter how complex.


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Get Best Reaction Injection Molding (RIM) Services from Topgrid!

Why Choose Topgrid ?

Get best Reaction Injection Molding (RIM) from topgrid

Excellence and Precision

We are committed to providing our customers with the highest quality products and services. 

We have a team of experienced engineers and technicians who are dedicated to ensuring that your products meet your exact specifications.


We understand that every project is unique. That’s why we offer a wide array of customization options.

From material selection and color to design modifications and finishing touches, we’re here to turn your vision into a reality.

Rapid Turnaround

We know that time is money in the business world.

Topgrid is committed to meeting your deadlines and getting your products to market as quickly as possible without sacrificing quality.

Cost-Effective Solutions

We work diligently to provide cost-effective solutions that meet your budget.

Our efficient manufacturing processes and competitive pricing make us a cost-conscious choice for your projects.

Here are Some Reaction Injection Molding (RIM) Projects,
we’ve worked on


RIM is widely used in the automotive industry to produce a variety of parts, such as bumpers, spoilers, fenders, body panels, and trunk covers

Electronic enclosures

RIM is a popular choice for manufacturing electronic enclosures because it can produce complex shapes with high dimensional accuracy.

Medical Device

RIM is also used to produce a variety of medical devices, such as catheters, tubing, and housings for medical instruments

Consumer products

RIM is also used to produce a variety of consumer products, such as toys, appliances, and housewares.

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