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Reaction Injection Molding mold, is a specialized tooling solution used to produce large, lightweight and complex plastic components through the reaction injection molding process.
Unlike conventional injection molding, RIM molding uses two or more liquid reactive materials that are mixed and injected into the mold, where they chemically react and cure to form the final part. This process enables the production of parts with complex geometries, smooth surfaces and integrated features.
RIM molds are typically manufactured from materials such as aluminum, steel or other suitable tooling materials, depending on production volume, part requirements and service life.
The right surface finish can improve appearance, corrosion resistance, wear resistance and service life.
| Black Oxide | Zinc Plating | Nickel Plating | Passivation | Painting | Heat Treatment |
| Create a black surface and provide basic protection |
Provide basic corrosion protection for steel parts |
Enhance appearance and protection for metal parts |
Improve surface condition and corrosion resistance for stainless steel |
Add color and protection for a wide range of applications |
Improve material performance based on usage requirements |
The right surface finish can improve appearance, corrosion resistance, wear resistance and service life.
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Anodizing
Improve appearance and basic protection for aluminum parts
🎨
Powder Coating
Provide good appearance and surface protection for metal parts
💨
Sandblasting
Improve surface texture and prepare for further finishing
📏
Brushing
Create linear texture for a refined and consistent look
✨
Polishing
Enhance smoothness and appearance for metal surfaces
💧
Electroplating
Improve appearance or function with a metallic coating
⬛
Black Oxide
Create a black surface
and provide basic protection
🛡️
Zinc Plating
Provide basic corrosion
protection for steel parts
🪙
Nickel Plating
Enhance appearance
and protection for metal parts
✅
Passivation
Improve surface condition
and corrosion resistance for stainless steel
🖌️
Painting
Add color and protection
for a wide range of applications
🔥
Heat Treatment
Improve material performance
based on usage requirements
Trendy delivers reliable and industry‑grade manufacturing performance across a wide range of supported parameters, ensuring stable quality,
precise tolerances, and consistent results for both prototypes and production parts.
| Guidance | Quick Turn Molding | ||
| Tooling | Prototype grade aluminum molds | ||
| Mold Shot Life | Up to 2,500 shots | ||
| Size Limitations | Max XYZ of 1300×1200×800MM | ||
| Mold Finishes | 6 Standard finishes (SPI-A2, A3, B2, B3, light or heavy textured) | ||
| Material Selection | Limited to 25 families of materials, or customer supplied | ||
| Inspection Options | Standard XYZ Dimension Report | ||
| Typical Quote Response Time * | Same day, in as little as 2 hours | ||
| Part Lead Times | Fast as 10 business days | ||
Wide range of engineering plastics for different structural
| Technology | Available Materials (Grade / Designation) | ||
| RIM support material | ABS，Acetal / Delrin，HDPE，LDPE | ||
| Nylon，PEEK，PC / ABS，PC | |||
| PET，PETG，PMMA / PLA(Acrylic)，Polycarbonate | |||
| PPA，PPE，PPS，PSU | |||
| Standard silicone，Fluorosilicone (fuel and oil resistant)，Medical-grade silicone，Optical-grade silicone | |||
| PROTOTYPING
3D Printing Start your project with our rapid 3D printing service. Ideal for creating detailed prototypes and custom parts quickly, we use advanced technologies to deliver high-quality, high-resolution prints with precise tolerances.
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LOW VOLUME PRODUCTION
Vacuum Casting Our urethane casting service bridges the gap between prototyping and mass production. Perfect for low to medium-volume production, creating durable, high-quality parts with excellent surface finish and detail.
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HIGH VOLUME PRODUCTION
Injection Molding For large-scale production needs, our injection molding service is the optimal choice. It is capable of producing high volumes of parts efficiently, maintaining consistent quality and precision.
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✔ Large Parts ：The properties of the liquid polyurethane components enable them to fill molds for very large parts.
✔ Encapsulation of Inserts ： Inserts of many types can be placed into a mold prior to injection of the RIM material. The RIM material can also encapsulate many inserts during molding.
✔ Thick and Thin Walls： The RIM process offers you the flexibility to design parts with significant wall thickness variations.
✔ Class-A Surfaces ： The surface finish of parts molded with the RIM process allows manufacturers to produce Class A painted parts.
✔Secondary Over-Molding：Supports secondary over-molding to integrate inserts, different materials or functional features, reducing assembly steps and expanding design possibilities.
✔ Low Cost Tooling Options ：The low injection pressures of the RIM process allow for tooling to be manufactured quicker, and at lower cost, than tools used in traditional injection molding, or structural foam.
Your success depends on reliable parts. Our CNC machining services provide precision machining with a 90% first-pass yield. You can get quality CNC machined parts for both prototypes and production runs.
Self-Owned Factories and Manufacturing Handwork RIM
Trendy provides custom RIM (Reaction Injection Molding) service for low & medium volume large PU components. Our tailored RIM cost-saving solution reduces tooling cost by 40%–80% compared with conventional steel mold injection molding. Integrated insert molding, overmolding and secondary finishing help minimize assembly work and scrap rate.
Our RIM workshop delivers an annual production capacity up to 30,000+ pieces, supporting batch sizes from 50 to 5,000 units per project. Fast sampling within 5–7 days accelerates your product launch, ideal for robotics, medical equipment, automotive and industrial housings.
Custom RIM (Reaction Injection Molding) for large PU parts
RIM cost-saving solution: 40%–80% tooling cost reduction vs steel mold injection molding
Annual capacity up to 30,000+ pieces
Flexible batch: 50–5,000 units per project
Insert molding & overmolding available
Fast sampling in 5–7 days
For robotics, medical devices, automotive & industrial enclosures
Trendy is a trusted provider of CNC turning services, serving customers across a wide range of industries. Equipped with advanced CNC turning capabilities and a team of seasoned engineers, we deliver reliable solutions covering rapid prototyping all the way to high‑volume, production‑grade CNC‑turned components.
Multi‑axis & 5‑axis CNC capability for both simple turned parts and complex 3D milled components.
Full in‑house inspection ensures tight tolerance, smooth surface finish and stable consistency.
Free DFM review and technical consultation to reduce machining risks and improve manufacturability.
Quick quotation, streamlined workflow, urgent prototype support and stable mass‑production supply.
Smart process planning to reduce unnecessary cost while maintaining high quality.
Integrated machining + surface finishing (anodizing, sandblasting, plating, etc.) for assembly‑ready parts.
Send us your drawings, sample photos or application details. We’ll help you evaluate the best material based on structure, process, finish, environment and target cost.
Large-format 3D printing is ideal for non-standard custom parts, prototypes, tooling, exhibition props, and repeated R&D testing.
One of the wrold’s leading one-top mould solutions providers and customized metal and plastic precision parts to production services
Copyright © 2026 Trendy Precision