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Reaction Injection Molding (RIM) Services | Large Part Solutions

Transform your large-scale manufacturing with Evok's advanced Reaction Injection Molding services. Our RIM technology delivers exceptional structural integrity for oversized components while reducing tooling costs and production time. With 25 years of injection molding expertise, we engineer complex geometries and high-performance polyurethane parts that traditional thermoplastic methods cannot achieve. From automotive body panels to industrial enclosures, our RIM solutions provide the strength, flexibility, and design freedom your demanding applications require.

Large polyurethane component being produced through reaction injection molding process

Our RIM Manufacturing Services

Complete reaction injection molding solutions from concept to production for large-scale polyurethane components.

RIM Part Design

Expert design optimization for reaction injection molding applications. We analyze wall thickness, draft angles, undercuts, and structural reinforcement requirements to ensure your large parts achieve optimal strength-to-weight ratios and dimensional accuracy with polyurethane chemistry.

RIM Material Selection

Comprehensive polyurethane system selection including rigid, flexible, and structural foam formulations. Our material experts match chemistry properties to your performance requirements including impact resistance, thermal stability, chemical resistance, and surface finish specifications.

RIM Prototype Development

Rapid prototype services using RIM-compatible materials and processes to validate design feasibility before production tooling investment. We produce functional prototypes that accurately represent final part performance, cosmetics, and assembly integration for your large components.

RIM Tooling Design

Cost-effective aluminum or composite tooling designed specifically for reaction injection molding pressures and temperatures. Our mold engineering optimizes cavity layout, runner design, mix chamber integration, and thermal management to maximize part quality and tool longevity.

Production RIM Manufacturing

High-volume reaction injection molding production with precise metering, mixing, and injection control. Our production capabilities deliver consistent large parts with excellent surface finish, dimensional repeatability, and predictable cycle times for your demanding applications.

RIM Quality Assurance

Comprehensive inspection and testing protocols including dimensional verification, material property validation, and durability testing. We provide detailed first article reports, process monitoring data, and ongoing quality documentation to ensure your RIM parts meet all specifications.

Advanced Polyurethane Technology

Engineering Excellence in Large Part RIM Solutions

Evok's reaction injection molding services combine 25 years of injection molding expertise with cutting-edge polyurethane chemistry to deliver exceptional large parts. Unlike traditional thermoplastic injection molding, RIM allows for significantly larger components with lower tooling investment and superior structural properties. Our engineering team optimizes every aspect from material formulation and mold design to process parameters and post-molding operations. We specialize in complex geometries that leverage RIM's unique advantages—thick sections without sink marks, integrated skin-foam-skin structures, and Class A surface finishes on oversized parts. Whether you need automotive fascia, industrial equipment housings, or medical device enclosures, our white-glove approach ensures your RIM project delivers jewelry quality at optimized cost.

Engineer examining large polyurethane RIM molded part with technical specifications
Trusted by Industry Leaders

Proven RIM Success

Leading OEMs trust Evok for mission-critical reaction injection molding applications across automotive, powersports, and industrial sectors.

"driven with details ... Very impressive"

Lawrence Dathe
Lawrence Dathe

"Great expertise and people!"

Rick Chen
Rick Chen

"Evok provided exceptional service! Paul and the studio team demonstrated amazing expertise and professionalism throughout the process. They exceeded expectations with precision and timely execution. Highly recommend for any project requiring top-notch design solutions."

Jason Salveson
Jason Salveson

"Great customer service! Paul is super dedicated."

Mo Amin
Mo Amin

"Paul is very knowledgeable and passionate regarding all facets of plastics manufacturing."

Matt Maskell
Matt Maskell

"Amazing business and amazing person to work with.Paul and I grew up together he has always had attention to detail in everything he has ever done,my company has used him a couple times now and are so pleased with the outcome I would recommend the company to anyone, once again..."

Kevin Nattress
Kevin Nattress

"Had a Great to work with Paul and it has been great! Has a plethora of knowledge and was great to learn from."

Landen Pool
Landen Pool

"driven with details ... Very impressive"

Lawrence Dathe
Lawrence Dathe

"Great expertise and people!"

Rick Chen
Rick Chen

"Evok provided exceptional service! Paul and the studio team demonstrated amazing expertise and professionalism throughout the process. They exceeded expectations with precision and timely execution. Highly recommend for any project requiring top-notch design solutions."

Jason Salveson
Jason Salveson

"Great customer service! Paul is super dedicated."

Mo Amin
Mo Amin

"Paul is very knowledgeable and passionate regarding all facets of plastics manufacturing."

Matt Maskell
Matt Maskell

"Amazing business and amazing person to work with.Paul and I grew up together he has always had attention to detail in everything he has ever done,my company has used him a couple times now and are so pleased with the outcome I would recommend the company to anyone, once again..."

Kevin Nattress
Kevin Nattress

"Had a Great to work with Paul and it has been great! Has a plethora of knowledge and was great to learn from."

Landen Pool
Landen Pool

"driven with details ... Very impressive"

Lawrence Dathe
Lawrence Dathe

"Great expertise and people!"

Rick Chen
Rick Chen

"Evok provided exceptional service! Paul and the studio team demonstrated amazing expertise and professionalism throughout the process. They exceeded expectations with precision and timely execution. Highly recommend for any project requiring top-notch design solutions."

Jason Salveson
Jason Salveson

"Great customer service! Paul is super dedicated."

Mo Amin
Mo Amin

"Paul is very knowledgeable and passionate regarding all facets of plastics manufacturing."

Matt Maskell
Matt Maskell

"Amazing business and amazing person to work with.Paul and I grew up together he has always had attention to detail in everything he has ever done,my company has used him a couple times now and are so pleased with the outcome I would recommend the company to anyone, once again..."

Kevin Nattress
Kevin Nattress

"Had a Great to work with Paul and it has been great! Has a plethora of knowledge and was great to learn from."

Landen Pool
Landen Pool
The Evok Advantage

Why Choose Evok for RIM Services?

Experience the Evok difference: deep technical expertise, proprietary process optimization, and unwavering commitment to your success.

25+ Years Expertise

Quarter-century of injection molding mastery with specialized knowledge in reaction injection molding for large, complex components.

Material Science Depth

Expert guidance in polyurethane chemistry selection, formulation optimization, and material property testing to match your exact performance requirements.

Cost-Optimized Tooling

Proprietary tooling strategies that minimize upfront investment while maintaining production quality and maximizing mold longevity for RIM applications.

White-Glove Service

Dedicated project management and technical support throughout your entire RIM development journey from initial concept through high-volume production.

Meet Our RIM Experts

Industry veterans dedicated to your large part manufacturing success.

Paul Dathe, Founder and Chief Engineer at EVOK Polymers

Paul Dathe

Founder

Paul Dathe founded Evōk Polymers with a singular mission: delivering the highest quality injection molded components at the lowest possible price through proprietary technology and deep industry expertise. With over 25 years specializing in engineering, product design, and solving complex injection molding challenges, Paul brings unparalleled depth to every project. He holds four U.S. utility patents and earned Six Sigma black belt certification, applying rigorous process optimization to mold design engineering. Prior to founding EVOK, Paul led new product development at Caliber Products, launching 13 products while growing sales 540% and expanding from 25 to 144 customers with 100% retention. His responsibilities spanned tooling design, functional assessments, 3D modeling, prototype fabrication, tolerance analysis, and mold flow studies. Earlier, as Senior Mechanical Engineer at Entegris, Paul managed a $40 million product line of ultra-clean liquid delivery systems for semiconductor applications. He began his career at Rollerblade in design and prototyping before serving in senior engineering roles at General Mills and Boston Scientific. Paul earned his Bachelor of Science in Mechanical Design from Bemidji State University with emphasis in rapid prototyping and 3D computer modeling. He's an active member of Allied Executives Business Leadership Peer group and the Institute of Packaging Professionals.

Jason Weber, Industrial Designer at EVOK Polymers

Jason Weber

Industrial Designer

Jason is a seasoned industrial designer with a passion for creating innovative and functional injection molded products. His design philosophy is deeply influenced by his life within a multi-generational household with his wife, two sons, and mother, which nurtures innate empathy and keen observation of human behavior—qualities that translate directly into user-centered design excellence. Jason brings creative vision to EVOK's engineering projects, balancing aesthetic refinement with manufacturing practicality. His ability to understand how people interact with products ensures that every component he designs not only meets technical specifications but also delivers intuitive functionality and ergonomic comfort. Jason's multidisciplinary approach bridges the gap between pure engineering and real-world application, helping clients create products that resonate with end users. Outside the studio, Jason finds inspiration through cooking, gaming, and relaxation, activities that fuel his creative process and problem-solving abilities.

Shawn Monitor, Sr. Industrial Designer at EVOK Polymers

Shawn Monitor

Sr. Industrial Designer

Shawn Monitor has been an instrumental creative force on some of the most advanced injection molded seating and component projects of the last two decades. His particular expertise lies in graphically and physically communicating evolving design concepts and intricate part features through complex mechanical and visual prototypes built in diverse materials. Shawn creates photorealistic renderings using Otoy OctaneRender® and develops professional layouts, diagrams, and logos with Adobe Creative Cloud, providing clients with clear visualization of engineering concepts before tooling commitment. His deep involvement in pre-molding design reviews has significantly reduced risk on numerous large-scale projects by identifying and resolving potential manufacturing issues early in the development cycle. Shawn excels at finding mechanical molded part solutions that can be prototyped and validated prior to expensive production tooling, saving clients time and money while ensuring design intent is maintained. He holds several patents reflecting his innovative approach to injection mold component design. Beyond his professional achievements, Shawn practices photography and enjoys the vibrant Twin Cities live music scene, interests that sharpen his visual communication skills and creative thinking.

Daniel D. Hoyt, Ph.D., Business Development Manager at EVOK Polymers

Daniel D. Hoyt, Ph.D.

Business Development Manager

Daniel brings exceptional expertise in system and process design engineering, coupled with strategic partnership cultivation that sets EVOK apart in the injection molding industry. His passion for innovation and collaboration drives initiatives that challenge traditional norms in part design, prototyping, tooling, and injection mold manufacturing. Daniel's vision extends beyond disruption—he's building a community centered on continuous improvement, mutual benefit, and genuine partnership that empowers small and mid-sized businesses to compete at the highest levels. His leadership focuses on creating Lean Partnership-Based Organizations that optimize engineering processes and deliver sustainable growth. Daniel's proficiency as a facilitator, public speaker, teacher, and coach, combined with exceptional team-building and mentorship abilities, accelerates EVOK's mission to transform industry standards. Under his guidance, EVOK establishes new benchmarks for collaborative engineering success, ensuring clients receive not just technical expertise but strategic insights that drive their competitive advantage in demanding markets.

Natalie Weber, Operations Officer at Evok Polymers

Natalie Weber

Operations Officer – LIV

Natalie is a dedicated apprentice in product design and management who embodies the harmonious blend of creativity and sustainability in injection mold engineering. Possessing innate curiosity and a discerning eye for innovation, she tirelessly explores where design converges with environmental consciousness—bringing fresh perspectives to material selection and dematerialization strategies. Immersed in intangible design principles since childhood, Natalie grasps the profound impact injection molded products can have on the planet, driving her commitment to infusing eco-consciousness into every project facet. Her education in sustainability, combined with hands-on mentorship from seasoned professionals, accelerates her mastery of product design intricacies. Natalie investigates diverse materials, manufacturing techniques, and emerging technologies, always evaluating their ecological footprint and lifecycle implications. Her journey extends beyond creating aesthetically pleasing components—she's shaping a future where injection mold design engineering seamlessly integrates sustainability principles, leaving a positive legacy for generations while meeting demanding performance specifications.

Julie Young, Accounting and Finance Manager at Evok Polymers

Julie Young

Accounting and Finance Manager

Julie Young has been an integral part of Evok since its inception, bringing meticulous attention to detail and thorough financial expertise to the organization. As an experienced accounting professional, she excels in organizing and categorizing transactions, reconciling accounts, and producing clear, concise financial reports that enable informed business decisions. Julie's proficiency in accounting software ensures streamlined processes and timely delivery of financial information, maintaining compliance with all regulatory requirements. Her dedication to professionalism and confidentiality provides the financial backbone that supports Evok's operations and growth. Beyond standard bookkeeping, Julie plays a critical role in vendor relationship management, ensuring all partners are paid promptly and maintaining the trust-based environment that is central to Evok's values. Her reliable financial services support both the team's effectiveness and customer satisfaction by ensuring resources are properly allocated to deliver exceptional injection molding solutions.

Frequently Asked Questions

How does reaction injection molding (RIM) differ from the injection molding process for thermoplastics?

RIM differs fundamentally by using two low-viscosity liquid components (polyol and isocyanate) that chemically react inside the mold, rather than injecting melted thermoplastic pellets. This allows much lower injection pressures (50-200 psi vs. 10,000-30,000 psi), enabling larger parts with less expensive aluminum tooling instead of hardened steel. RIM produces thermoset polyurethane parts with excellent structural properties, while thermoplastic injection molding creates parts that can be remelted and reshaped.

What is the RIM process?

What is RIM manufacturing?

What is the difference between RIM and injection molding?

What is the process of rim molding?

What are typical lead times for RIM tooling and production?

What size parts can be produced with reaction injection molding?

How much does RIM tooling cost compared to traditional injection mold tooling?

Ready to Explore RIM for Your Application?

Our reaction injection molding experts are ready to evaluate your project requirements and recommend the optimal approach.

Certified Excellence

Awards and Recognition

Six Sigma Black Belt certification logo

Six Sigma Black Belt

Process optimization and quality assurance expertise

Industry experience badge showing 25 years

25+ Years Industry Experience

Proven injection molding expertise since 1999

U.S. patent portfolio recognition badge

4 U.S. Utility Patents

Innovation leadership in molding technology

Start Your RIM Project with Evok

Complete the form below and our reaction injection molding experts will contact you within 24 hours to discuss your large part requirements, material options, and project timeline.

Contact Us Today

For immediate assistance, feel free to give us a direct call at +1 612-991-2001.