The Xometry app works best with JavaScript enabled!
Order Status
Search
Our SolutionsIndustriesResourcesBuy SuppliesBecome a SupplierXometry EnterpriseHow Xometry Works
Additive Manufacturing

3D Printing Service

Metal 3D Printing Service

Solutions For Every Industry
CapabilitiesCustom Plastic Injection Molding ServiceLiquid Silicone Rubber Molding

Liquid Silicone Rubber Molding

Manufacture custom silicone prototypes and end-use production parts in 15 days or less in a range of durometers and grades of LSR materials.

How Does Liquid Silicone Rubber Injection Molding Work?

First, a liquid silicone rubber molding tool is created using CNC machining. This tool must be a high-temperature tool in order to withstand the LSR injection molding process. The tool may then be polished to allow for different finish options.

Next, the finished tool is loaded into an LSR-specific injection molding press that is precision geared for accurate control of shot size to produce the most consistent LSR parts. Materials used include standard silicones and specific grades to fit different part applications. Because LSR is a thermosetting polymer, its molded state is permanent. Unlike thermoplastics, they can’t be melted again. Once the LSR injection mold parts are ready, they are removed from the mold and then put to use as prototypes or production parts.

Injection molded silicone rubber is a great solution for a variety of industries including medical, lighting, and automotive.


The camera housing for the feevr device is compression molded

Xometry Injection Molding Capabilities

ServiceDetails
Service

Lead Time

Details

Starts at 15 business days, including 24-hour quote responses with design-for-manufacturing (DFM) feedback

Service

Production Options

Details

Domestic and international

Service

Machines Available

Details

Single, multi-cavity, and family molds; 50 to 1,100+ press tonnage; side actions including hand-loaded cores

Service

Inspection and Certification Options

Details

Includes FAI and PPAP. ISO 9001, AS9100, ISO 13485, UL, ITAR, and ISO 7 and 8 Medical Clean Room molding.

Service

Tool Ownership

Details

Customer-owned with mold maintenance

Service

Mold Cavity Tolerances

Details

+/- 0.005" when machining the mold and an additional +/- 0.002" per inch when calculating for shrink rate

Service

Part to Part Repeatability

Details

+/- 0.004" or less

Service

Critical Feature Tolerances

Details

Tighter tolerances can be requested and may increase the cost of tooling because of additional sampling and grooming. Xometry will mill to a steel-safe condition on critical features.

Service

Available Mold Types

Details

Steel and aluminum; Production grades range from Class 105, a prototype mold, to Class 101, an extremely high production mold. Xometry typically produces Class 104, 103, and 102 tools.

This table depicts the general tolerances for Xometry’s injection molding services and accounts for adequate draft, radii, and coring for manufacturability. Learn more about our injection molding manufacturing standards.

Additional Molding Options Available at Xometry

Insert Molding

Insert Molding Service

Make Strong, Functional Prototypes and Production Parts With Insert Molding
Insert Molding Service
Overmolding Part

Overmolding Service

High Quality Process for Pilot Runs, Low-Volume Production, and Bridge Tooling
Overmolding Service
Injection Molded Parts

Custom Plastic Injection Molding Service

Get custom plastic molded prototypes and production parts in as few as 10 business days. We provide expert engineering reviews and $500 off your first mold. Dozens of materials and finishes are available.
Custom Plastic Injection Molding Service

Liquid Silicone Rubber Injection Molding Materials

A wide variety of LSR materials for various applications and industries is available. Popular options include standard silicones along with medical-grade and fuel-resistant grade materials.

LSR Injection Molding Design Guidelines

FeatureTip
Feature

Undercuts

Tip

Reduce undercuts, which will increase the complexity and cost of the tool ejection mechanisms, by adding in pass-thru coring.

Feature

Wall Thickness

Tip

Prevent wall sink and voids by maintaining an even wall thickness. Thinner walls reduce cycle time and reduce costs.

Feature

Drafts

Tip

Ensure liquid injection molding parts are designed with a minimum draft angle of 0.5°, or up to 5°, for faces with medium textures.

Feature

Ribs/Gussets

Tip

Ribs should be 40-60% the thickness of outer walls and should still maintain draft.

Feature

Bosses

Tip

Bosses should be designed at a depth of 30% the wall thickness and with a 30% edge groove. Attach them to side walls or ribs for structural integrity.

To see these design-for-manufacturing recommendations in detail, view our Injection Molding Design Guide.

LSR injection molding machine graphic

Ready to Get an LSR Injection Molding Quote?

Applications and Advantages of LSR Injection Molding

Injection Molded Part
Durability
Injection Molded Part

LSR molded parts offer great UV and ozone resistance and outstanding electrical insulation

Wide Hardness Range
Injection molding parts with pass thru coring

Range from 10 to 80 durometer shore A

Versatility
plastic pellets used for molding

LSR molding is a great for gaskets, cushioning pads in portable communications, ruggedized electronic devices, and many more applications.

Why Use Xometry Injection Molding Services?

Massive Network Capacity

Endless Options

Choose from millions of possible combinations of materials, finishes, tolerances, markings, and certifications for your order.

Xometry Instant Quoting Engine

Easy to Use

Get your parts delivered right to your door without the hassle of sourcing, project management, logistics, or shipping.

Guaranteed Quality

Vetted Network

We are ISO 9001:2015 certified and AS9100D compliant. Only the top molders that apply to become Suppliers make it through our qualification process.