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Injection Molding Service
Custom Molded Prototypes and Production Parts with Fast Lead Times
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High Quality Plastic Injection Molding
Need molded parts that are truly custom? You have come to the right place. Xometry delivers high-quality, on-demand injection molding for prototypes and production parts.
Xometry takes a “have it your way” approach to molding, no matter your level of experience. We specialize in complex projects, including those requiring side action or hand loaded inserts. Our goal is to provide a long-term solution, moving beyond rapid prototyping, with dedicated project managers and engineering experts to communicate through all project stages from design to production. We offer molding solutions for every industry, including medical injection molding.
Injection molding, aka injection moulding, is the most cost-effective way to make a plastic part at scale and offers consistent quality for low-to-high volume manufacturing. Molding also has the highest variety of materials, colors, and configurations when compared to CNC machining or even 3D printing. Beyond materials, injection molded parts can have custom cosmetics, polishes, or surface textures.
Xometry's Injection Molding Services
Our services are custom tailored for your needs:
- Free online file upload and quote submssion
- 24-hour quote responses with design for manufacturing (DFM) feedback
- Large domestic partner network and international production options
- Single point of contact per customer
- Single-, multi-cavity, and family mold options
- Most plastic materials, including custom sourcing and matching
- Press availability from 50 to 1,100+ tons
- Part inspection, including FAI and PPAP options
- Customer-owned tooling
- Injection molding capabilities for the medical device Industry
Insert Molding and Overmolding
Insert Molding Service
Make Strong, Functional Prototypes and Production Parts With Insert Molding
Overmolding Service
High Quality Process for Pilot Runs, Low-Volume Production, and Bridge Tooling
Plastic Injection Molding Materials
Rigid And Flexible Plastic Varieties
| Plastic Molding Resins | ||
|---|---|---|
| ABS | Acrylonitrile Butadiene Styrene | PC-ABS | Polycarbonate-Acrylonitrile Butadiene Styrene | PMMA | Polymethyl Methacrylate, Acrylic |
| ASA | Acrylonitrile Styrene Acrylate | PC-PBT | Polycarbonate-Polybutylene Terephthalate, Xenoy | POM | Acetal Polyoxymethylene, Delrin |
| CA | Cellulose Acetate | PC-PET | Polycarbonate-Polyethylene Terephthalate | PP | Polypropylene |
| COPO | Copolyester | PCT | Polycyclohexylenedimethylene Terephthalate | PPA | Polyphthalamide |
| HDPE | High-Density Polyethylene | PE | Polyethylene | PPS | Polyphenylene Sulfide, Ryton |
| LCP | Liquid Crystal Polymer | PE-PP | Polyethylene-Polypropylene | PS | Polystyrene |
| LDPE | Low-Density Polyethylene | PE-PS | Polyethylene-Polystyrene | PS-PPE | Polystyrene-Polyphenyl Ethers, Noryl |
| PA 6 | Polyamide 6, Nylon 6 | PEBA | Polyether Block Amide | PSU | Polysulfone, Udel |
| PA 6/6 | Polyamide 6/6, Nylon 6/6 | PEEK | Polyether Ether Ketone | PVC | Polyvinyl Chloride (Shore D) |
| PARA | Polyaryl Amide | PEI | Polyetherimide, Ultem | PVDF | Polyvinylidene Fluoride |
| PBT | Polybutylene Terephthalate, Valox | PES | Polyether Sulfone | SAN | Styrene Acrylonitrile |
| PBT-PET | Polybutylene Terephthalate-Polyethylene Terephthalate | PET | Polyethylene Terephthalate, Rynite | TPO | Thermoplastic Polyolefin |
| PC | Polycarbonate | PLA | Polylactic Acid | TPU | Thermoplastic Polyurethane (Shore D) |
Check out more information our materials here.
Elastomers and Synthetic Rubbers for Molding
Rubber-Like Varieties
| Elastomers and Rubber-Like Materials | |
|---|---|
| EPDM | Ethylene Propylene Diene Monomer Rubber, Viton | TPE | Thermoplastic Elastomer, Santoprene |
| MPR | Melt Processable Rubber | TPU | Thermoplastic Polyurethane (Shore A) |
| POE | Polyolefin Elastomer | TPV | Thermoplastics Elastomer, Vulcanized Rubber |
| PVC | Polyvinyl Chloride (Shore A) | LSR | Liquid Silicone Rubber |
Check out more information our materials here.
Custom Sourced Materials
A variety of injection-molded plastic part options are available for an online quote. If you do not see the material stock you are looking for, please choose "Custom" under the material drop-down on your quote page and submit for an expert engineering review once you have specified features, tolerances, inspection needs, and quantities required. Xometry can also use customer-source or customer-supplied resin for production projects!
Injection Molding Finishes
Standard Finish
Moldmaker's choice of finish. Typically SPI B-3 to D-3 depending on geometry and drafts. Interior, non-cosmetic faces, are typically as-machined.
SPI Finishes
Range of finishes from Grade 3 diamond / high polish to 320 stone low polish. Finishes include: SPI A-1 , SPI A-2, SPI A-3, SPI B-1, SPI B-2, SPI B-3, SPI C-1, SPI C-2, SPI C-3, SPI D-1, SPI D-2, and SPI D-3
MoldTech Finishes (Mold Texturing)
Range of finishes including matte, swirls, lines, and patterns. Our most common texture finishes include: MoldTech MT11010, MoldTech MT11020, and MoldTech MT11030. Other textured finishes can be added by request.
As Molded
No secondary polishing or grinding. Part will show tooling marks.
Threaded Inserts
We can install most commonly used standard inserts in UNF and metric sizes.
Pad Printing
Transfer a 2D image onto a 3D part. All images are subject to review.
Laser Engraving
Engrave part numbers, logos, and more onto your parts.
Assembly
Xometry has the ability to assemble & label molded parts. Discuss your needs with your salesperson.
Ready to get started on your custom injection molding quote?
Injection Molding Applications
Rapid Prototyping
Low-cost tooling allows molded parts to be produced very rapidly and cost-effectively.
Production Parts
Molding is best known for its unmatched production capabilities from thousands to millions of identical parts.
Range of Industries and Certifications
We offer ISO 9001, AS9100, ISO 13485, UL, ITAR, and ISO 7 & 8 Medical Clean Room molding.
Advantages of Injection Molding
Scalability
Molding can be the ideal process for custom production runs of 250 to 250,000+ parts.
Efficiency
In higher volumes, custom molding with Xometry produces significantly less waste than other manufacturing processes.
Rapid Turnaround
High quality molded parts in as little as 10 business days.
Part Production
Piece price is significantly lower with injection molding vs other processes, particularly as production quantities increase into the thousands.
Strength
Molded parts will generally perform better than the same part CNC Machined or 3D printed using the same material. Careful selection of the resins allow for a wide range of properties and solvent compatibility.
Precision
Molds are CNC machined to high precision, high tolerances and are able to produce thousands of identical parts with very small and intricate details.
Injection Molding Tolerances
| Description | Tolerance Notes |
|---|---|
| Mold Cavity Tolerances | Typical tolerances are +/- 0.005" when machining the mold and an additional +/- 0.002"/in when calculating for shrink rate. |
| Part to Part Repeatability | +/- 0.004" or less. |
| Critical Feature Tolerances | Tighter tolerances can be requested and may increase the cost of tooling. Additionally, many tight tolerances require the mold to be manufactured, sampled, and then groomed. Xometry will mill to a steel-safe condition on critical features. |
This table is based on the assumption that designs have an adequate draft, radii, and coring for manufacturability. Please check out Xometry's Manufacturing Standards for more information on tolerances per process.
Mold Class Glossary
Mold Class Glossary
| Name | Cycles | Description |
|---|---|---|
| Class 105 | Under 500 | Prototype only. This mold will be constructed in the least expensive manner possible to produce a very limited quantity of prototype parts. Also known as a Class V tool. Example: a one-and-done market test of 100 molded units. |
| Class 104 | Under 100,000 | Low production mold. Use only for limited production preferably with non-abrasive materials. Low to moderate price range. Also known as a Class IV tool. Example: Aluminum or MUD tooling, SPI B-3 finish, hand-loaded cores and limited re-runs. |
| Class 103 | Under 500,000 | Medium production mold. This is a very popular mold for low to medium production needs. Most common price range. Also known as a Class III tool. Example: Aluminum or steel tooling, automated lifts or slides, multiple re-runs with batches between 1,000-5,000 units. |
| Class 102 | Under 1,000,000 | Medium to high production, good for abrasive materials and/or parts requiring close tolerance. This is a high quality, fairly high priced mold. Also known as a Class II tool. Example: Steel tooling with an SPI A-2 finish, automated slides, scheduled production cycles. |
| Class 101 | Over 1,000,000 | Built for extremely high production. This is the highest-priced mold and is made with only the highest quality materials. Also known as a Class I tool. Example: Multiple-cavity steel tooling with full automation and overnight production workcenters for dedicated part manufacturing. |
The injection molding industry often defines molds by their class. This goes from Class 105, a prototype mold (e.g., a 100 piece one-and-done market test), to Class 101, which is built for extremely high production (e.g., making tens-of-millions contact lens cases). Xometry typically produces Class 104, 103, and 102 tools.
What is Injection Molding?
The Basics Of Injection Molding
Injection molding is one of the most often-used manufacturing processes for creating plastic parts. Thanks to its high-precision, repeatability, and cost efficiency at scale, injection molding is used to make a variety of products and parts from the smallest medical insert up to large automotive & aerospace and defense parts. The injection molding process requires an injection molding machine, raw plastic material, and a machined mold. The raw plastic material is first melted in the injection unit and is then injected into the mold — most often machined from steel or aluminum — where it cools and solidifies into the final plastic part. The key steps in the injection molding process are clamping, injection, cooling, and ejection.
Benefits Of Injection Molding
Custom injection molding offers a number of benefits not found in other manufacturing processes. Due to the high-pressure nature of the injection molding process, it is much easier to manufacture parts with detailed features or complex geometries that would be too costly for typical CNC machining processes. The ability to use your mold over and over again for a long period of time leads to an extremely high production output rate which is more cost effective and efficient than other manufacturing processes. Lastly, different injection molding processes, such as overmolding and insert molding, allow you to create plastic parts with unique characteristics such as enhanced strength, soft-grip surfaces, or added flexibility. Also beneficial is the ability to combine multiple assembly processes into one injection molding process.
Types of Injection Molding at Xometry
Thermoplastic Injection Molding
Xometry delivers top quality plastic injection molded parts in as little as 10 business days. Our Manufacturing Partner Network can help you design and manufacture tools, dies, and molds for rapid tooling for prototyping to advanced mold making for production runs. Full injection molding capabilities including insert molding, overmolding, unlimited undercuts, and internal/external threads are available.
Range of Mold Making Options
Our vetted network of partners allow us to quickly convert your 3D part data into a high-quality injection mold at top speed. We offer services from design and manufacturing for tools, dies, and molds for prototyping and production runs. Plastic blow molds, aluminum and steel tooling, 2-shot and 3-shot molding are also available. And with Xometry, you own your own tools, so our partner network also offers mold maintenance services.
Why Choose Xometry for Injection Molding?
Endless Options
Choose from millions of possible combinations of materials, finishes, tolerances, markings, and certifications for your order.
Easy to Use
Get your parts delivered right to your door without the hassle of sourcing, project management, logistics, or shipping.
Vetted Network
Only the top 6% of shops that apply to become Partners make it through our multi-tiered qualification process, so you can be confident your parts will be made right.
