How RIM Tooling Compares to Injection Molding Tools
The process of RIM and injection molding involve very different molds. To learn how RIM tooling compares to injection molding tooling, consult this comparison.
Engineered, tooled, and produced in California. Built to your spec.
Backed by 40+ years of RIM expertise & excellence.
Our team is ready to support your project anytime.
Rimnetics works with various manufacturers in medical, scientific, industrial and robotic industries, who need large, complex, structural parts produced with consistency—not compromise. We’re not a commodity molder. We design and deliver complete molded solutions, all from a single source.
Whether it’s a one-piece medical enclosure or a multi-component robotic housing reduced to just a few parts, we handle design review, tooling, molding, and finishing under one roof. Our Loomis, CA facility supports everything from early prototypes to full production, with initial CAD feedback within 24-72 hours.
We’re not a commodity molder. We design and deliver complete molded solutions, all from a single source.
40+
Backed by 40+ years of RIM expertise.
Reaction injection molding (RIM) is a versatile manufacturing process that involves combining two liquid components, which then chemically react and harden within a mold to form a finished product. This technique is particularly beneficial for creating complex and detailed lightweight parts. Reaction injection molding techniques—such as those used at Rimnetics—excel in producing RIM-molded products that offer exceptional strength, durability, and design flexibility. The RIM molding process allows for intricate details and can be employed with a variety of materials, making it ideal for a wide range of industries and applications.
| Consideration | RIM | Traditional Injection Molding | Thermoforming | Sheet Metal |
|---|---|---|---|---|
| Large, complex 3D parts | Yes, a RIM sweet spot | Limited to small parts | Yes, but single-surface geometry only | Requires multi-step assembly |
| Structural, self-supporting | Yes, polyurethane structural foam | Requires structural frame | Limited, typically requires a frame | Requires structural frame |
| Thin and thick walls in same part | Yes, no sink marks or warp | Very limited variation | No, uniform wall thickness only | Must weld different thicknesses |
| Encapsulate electronics/hardware | Yes | Hardware inserts only | Not possible | Not possible |
| Tooling cost | Low | High to very high | Low to moderate | Low to very expensive |
| Prototype tool becomes production tool | Yes | Limited | Yes | Limited |
| Annual production volumes | Low to medium | Medium high to extremely high | Low to medium | Low to medium |
We partner with innovative teams across industries where performance, precision, and reliability aren’t optional.
Structural enclosures and housings for diagnostic equipment, imaging systems, and medical carts.
Instrument housings and enclosures for analyzers, benchtop equipment, and scientific instruments.
Structural housings for robotic systems and automation platforms.
Enclosures for kiosks, ATMs, industrial control systems, and connected devices.
Structural parts and enclosures for industrial machinery and equipment panels.
Send us your CAD file and we’ll provide an initial feasibility assessment.
.jpg)
Every project runs through the same process: design review, tooling, molding, finishing. All of it in-house, all of it in California.
Submit your CAD file for design optimization, tooling development, and manufacturability review. We evaluate each part early and provide clear guidance on whether RIM molding is the right fit for your application.
Learn more →Integrate electronics, PCBs, or existing components directly into the molded part to reduce assembly and improve protection. RIM encapsulation enhances durability and performance in demanding environments.
Learn more →Complete your RIM parts with in-house trimming, machining, painting, and final assembly. We deliver production-ready components with consistent quality, tight tolerances, and a high-performance finish.
Learn more →Create durable, lightweight enclosures with integrated features and clean, functional design. RIM molding supports complex geometries and structural strength without traditional manufacturing constraints.
Learn more →Produce oversized, thick-walled, complex components without the high tooling costs or weight limitations of injection molding. RIM molding is ideal for large parts that require strength, stability, and design flexibility.
Learn more →
Upload your CAD file and our engineering team will review it for technical and economic feasibility. No commitment required.
Here’s what the engineers, sourcing managers, and product teams who work with us have to say.
The precision and consistency Rimnetics delivers on large structural parts is unmatched in our experience. Their design review caught issues before tooling that saved us months.
Rimnetics consolidated a multi-part housing into a single molded piece and cut our assembly time dramatically. They are a true engineering partner, not just a molder.
Rimnetics is more than a RIM molding manufacturer—we’re a long-term partner in your product’s success.
Deep RIM expertise means faster decisions, fewer issues, and smoother production ramps.
Design, tooling, molding, and finishing—all handled in one facility for better quality and control.
Faster adjustments and shorter timelines with tooling and molding under one roof.
Aluminum tooling reduces upfront cost and supports both prototyping and production.
Trusted by medical and technical manufacturers where precision and reliability matter most.
Three decades of molded solutions, engineered and produced in California.
Registered quality management — audited and certified by Intertek.
Send your CAD file and receive initial design feedback, typically within 24-72 hours
Hundreds of aluminum tools produced for the most diverse applications.
We maintain rigorous quality standards to ensure every part meets your requirements.
.webp)

Explore expert insights, technical guides, and best practices for RIM molding and product development.
The process of RIM and injection molding involve very different molds. To learn how RIM tooling compares to injection molding tooling, consult this comparison.
Low-pressure overmolding ensures enhanced product durability and protection with minimal stress on components. Learn how it would benefit your business.
Understanding the differences between compression molding versus reaction injection molding can assist you in making a well informed decision.
If you’re designing a large, complex part and need a manufacturing partner who can handle everything from design to production, let’s talk.
Upload your CAD file for a fast feasibility review, or reach out to us today to speak with a RIM specialist.