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RIM (Reaction Injection Molding) is a rapid tooling technology. Liquid polyurethane components are mixed and injected into molds, curing via chemical reaction to form solid parts.
It is a cost-efficient choice for low & medium-volume large-size PU components. We provide flexible-to-rigid PU material options, paired with our full portfolio of manufacturing services to deliver integrated OEM & ODM solutions.
Reaction Injection Molding Service
RIM (Reaction Injection Molding), is a Rapid Tooling process where parts are made from mixing and injecting PU materials into a mold and cured through a process of polymerization (molecular cross-linking) in a low pressure / room temperature environment. Because of Trendy ‘s High Efficiency, Short Cycle, Low Cost Production Runs, we can offer the best RIM processing solutions & assure fast deliveries worldwide.
RIM molding material utilized by Design Octaves is a two-component system which consists of polyol and isocyanate liquids that are mixed at a high pressure and then metered into the closed tool at a low pressure. The material then expands to fill the tool and is ejected in about 5 minutes.
Advantages of Reaction Injection Molding Service
RIM molding allows for many distinct advantages, some of which include:
✔ 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.
✔ 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.
Why Choose Us for Reaction Injection Molding?
Simple And Convenient Molding Processes
Compared to Plastic Injection Molding, RIM （Reaction Injection Molding） is a simpler and more convenient process with a shorter production cycle. Compared to Vacuum Casting, RIM offers a higher level of automation and efficiency. Compared to Thermo-Forming and Board Bonding, RIM is a more flexible design option. RIM parts can be designed with elaborate surface details and Class A surfaces, with integrated structures and different wall thicknesses, and with machining stability and accuracy.
Professional Low-Cost mold Design & Mold Making
When making RIM molds, clients can choose to use low-cost casting materials. Using ABS, Epoxy, and Aluminum mold making materials, Trendy can make molds of all sizes for all kinds of applications. Our RIM Technicians provide professional technical suggestions and the best solutions in accordance with each client’s specific project requirements. At Trendy RIM Mold Design and Mold Making services can be completed within 2 weeks or less.
Big & Thin walled Parts
With our experience in mold design, mold making, controlling precision processes, and using quality materials, Trendy can make large RIM parts with 3 to 6 mm wall thicknesses that have High Rigidity and High Strength. Even though the walls are only 3 to 6 mm thick, the edge of the material is rigid and strong enough to provide excellent stability.
what can supply range material with capacity
| Item | Specifications |
|---|---|
| Guidance Tooling | Quick Turn Molding |
| Mold Shot Life | Up to 2,500 shots |
| Size Limitations | Max XYZ: 1300mm × 1200mm × 800mm
(Note: The original inch unit is suspected to be a typo) |
| Mold Finishes | 6 standard finishes (SPI-A2, A3, B2, B3, light texture & heavy texture) |
| Material Selection | 25 material families available; customer-supplied materials acceptable |
| Inspection Options | Standard XYZ Dimensional Inspection Report |
| Typical Quote Response Time* | Same-day response, as fast as within 2 hours |
| Part Lead Times | Minimum 10 business days |
Case demonstration
Method: From RIM Mold injection
Injection: PC+30% GF
Surface: painting black matte
Large components → RIM; Small & medium parts → Vacuum Casting
＜50pcs → Vacuum Casting；50pcs–1000pcs → RIM
Higher batch consistency & long-run production → RIM
Prototype verification & small trial batches → Vacuum Casting
Quick, low initial investment for a small number of samples → Vacuum Casting
Lower unit cost for medium-volume mass trial → RIM
We provide RIM and Vacuum Casting for PU component manufacturing.
👉 Choose RIM for large-size parts, medium batch runs (50–1000 pcs) and superior batch consistency.
👉 Choose Vacuum Casting for small & medium prototypes, low volume (1–50 pcs) and fast design iteration.
Our engineers conduct DFM evaluation to match the best process for your project. We integrate casting with 3D printing and CNC services for complete one-stop manufacturing
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