Injection Molding Services
Fast. Precise. Reliable. Get plastic or metal custom injection molded parts, from prototypes to production. Upload your design for a free quote!
- Perfect for High & Low Volume Production
- Wide Range of Materials and Finishes
- Repeatable Part Quality
- Parts in as Few as 7 Days
Trusted by companies like
Why Choose 3ERP for Custom Injection Molding?
Get Your Instant QuoteOne-stop Services
End-to-end solutions from custom mold tooling to final part production, reducing delays and lead times.
Flexible Solutions
Molding specialists help choose rapid aluminum tooling or durable production molds based on the project.
No MOQ
Order exactly what you need for prototype or low-volume production without large upfront commitments.
Expert Review and Quotation
Engineers review your design, confirm quantities and pricing, then move quickly into fabrication.
Start Your Custom Injection Molding Project Today
All information and uploads are secure and confidential.
Get Your Instant QuoteOur Injection Molding Capabilities
We are ready for tight tolerances, thin walls, small draft angles, undercuts, complex geometry, and non-defect surface finishes.
Plastic Injection Molding Service
The most popular method for producing custom plastic parts for consumer products, automotive components, electronic enclosures, and more.
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Liquid Silicone Rubber Molding Service
LSR is inert, biocompatible, and ideal for durable flexible parts in medical devices, kitchenware, and consumer goods.
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Metal Injection Molding Service
MIM is a cost-effective option for small detailed metal parts in high volumes with less material waste.
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Overmolding Service
A second material is injected over a base part to create a composite with better grip, flexibility, or performance.
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Insert Molding Service
Metal or plastic inserts are embedded during injection to improve structural integrity and reduce assembly time.
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Quick-turn Injection Molding
Fast prototype parts can be produced in as little as 7 business days for urgent programs.
Learn MoreWhat is Injection Molding?
Injection molding is the process of injecting molten plastic or metal feedstock into a mold cavity, rapidly cooling it, then ejecting the solidified part.
It is the most widely used manufacturing process for plastic parts and one of the most affordable routes to mass production. Tooling requires upfront investment, but cost per part drops significantly once the mold is made.
Injection Molding Processes
Our custom injection molding service typically involves the following steps:
Part Design
Upload 3D CAD files and 2D drawings. Engineers review DFM and optimize the design for molding.
Tooling Fabrication
Steel or aluminum molds are built, T1 samples are produced, and approved parts move to production.
Material Selection
Materials, pigments, and additives are selected to meet appearance and performance requirements.
Injection Molding
Molten material is injected under high pressure into the mold cavity to form the part.
Cooling and Ejection
The part cools and solidifies, then ejector pins release it before the next cycle.
Finishing and Quality Control
Parts are trimmed, finished, assembled when needed, and inspected to specification.
Match Your Project with the Right Mold Class
We fabricate aluminum tooling for rapid, low-volume prototyping and tool steel molds for mass production. SPI classes define durability and expected cycle life.
| SPI Mold Classification | Production Cycles | Material | Application |
|---|---|---|---|
| 101 | 1,000,000+ | Hardened tool steel (H13, S7) | Mass production, automotive, appliances |
| 102 | 1,000,000 | Hardened steel, pre-hardened steel (P20) | Consumer goods, industrial parts |
| 103 | 500,000 | Pre-hardened steel; high-grade aluminum for limited use | Electronics, medical devices |
| 104 | 100,000 | Aluminum 7075 or carbon steel 1045 | Low-volume manufacturing, prototyping |
| 105 | 500 | Soft aluminum, epoxy resins, or 3D-printed polymers | Rapid prototyping, short-run production |
No mold yet? Explore our Injection Mold Tooling services and choose the right SPI class for your production needs.
Injection Molding Project & Customer Feedback
Injection molding is widely used for producing car parts, electronic enclosures, and kitchen appliances. With over 15 years of experience, 3ERP has helped numerous companies turn ideas into reality.
Tail Light
Material: Tooling: Aluminum; Injected parts: Custom material
Quantity: 300
Challenges: Housing, reflector, and lens components had to be fabricated on a tight timeline with real materials for testing.
Our Solution: Aluminum molds were chosen for faster production, and cavity splitting improved efficiency.
“You guys are the top gun!! I will be in touch with you when the next project is coming.” AL Lighting
Injection Molding Materials
A diverse range of industrial-grade materials is available for molded parts, from common plastics to high-performance temperature-resistant options.
Injection Mold Surface Finishes
We provide a full range of SPI surface finishes for injection molded parts. Use the chart below to select a finish grade for aesthetic and functional needs.
| SPI Grade | Finish | Method | Typical Application |
|---|---|---|---|
| SPI A | A-1 | Mirror gloss | 6000 grit diamond buff | Optical parts, lenses, transparent components |
| SPI A | A-2 | High gloss | 3000 grit diamond buff | Clear housings, consumer products |
| SPI A | A-3 | Normal gloss | 1200 grit diamond buff | General gloss finishes |
| SPI B | B-1 | Fine semi-gloss | Grit paper #600 | Smooth surface with slight texture |
| SPI B | B-2 | Medium semi-gloss | Grit paper #400 | Consumer electronics, automotive interiors |
| SPI C | C-1 | Fine matte | Stone #600 | Slightly textured surface |
| SPI D | D-1 | Fine satin texture | Dry blast glass bead #11 | Non-slip surfaces, tools, industrial parts |
| SPI D | D-3 | Normal texture | Dry blast oxide #24 | Very coarse or anti-glare finishes |
A customer’s words mean more than ours
See what satisfied customers have said about how we fulfilled their requirements.
3ERP provided fast communication, reliable quality, and manufacturing support that helped our project move forward with confidence.
FSAE School of Engineering
3ERP provided fast communication, reliable quality, and manufacturing support that helped our project move forward with confidence.
Trent L.
3ERP provided fast communication, reliable quality, and manufacturing support that helped our project move forward with confidence.