Custom Injection Molding

Built to Scale With Your Program

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Complex parts demand a molder who treats every project as custom.

Scientific molding, insert molding, and overmolding under one roof in Mundelein, Illinois.

Built for Parts That Cannot Be Standard

Some parts have to fit exactly with another component, or carry a design too intricate for a generic process. Medical devices and military components are common examples, and both come with strict compliance requirements and tight specifications. When a project is this demanding, custom injection molding is the only way to meet it.

Custom work relies on process technologies, analytical tools, and real scientific method, not guesswork. We build every custom project around four core techniques: scientific molding, insert molding, multi-shot molding, and overmolding, choosing the right combination for your part’s specific requirements.

Scientific Molding

Every run is measured and recorded. Our engineers track flow rate, temperature, and pressure in real time, so a defect free process can be repeated run after run.

Insert Molding

A solid component, often metal, is placed into the tool and resin is injected around it. The result is a stronger, more consistent part at a lower assembly cost.

Overmolding

A soft outer layer is molded over a rigid inner structure in a two-stage process, adding grip, comfort, and durability to parts for tools, devices, and equipment.

Multi-Cavity Tooling

Multi-shot and multi-cavity tools let us produce complex, multi-material parts efficiently, even at high volumes.

What Sets Crestwood Apart

We treat custom work as a partnership, not a transaction. From collaborative engineering and in-house tooling design to secondary operations and metal-to-plastic conversions, our team is involved at every stage of your product’s development.

Collaborative engineering and product development support
In-house tooling design, engineering, and management
Two-shot, insert molding, and overmolding on the same production floor
State-of-the-art quality control equipment, vertical and horizontal presses
Secondary operations including sonic welding, milling, tapping, drilling, testing, and assembly
Products engineered for critical-use applications
Industry certifications backing every production run
Metal-to-plastic applications and conversions

Tooling Options for Every Budget and Volume

✓3D-printed molds: fast, low-cost tooling for prototyping and very low-quantity runs.

✓Aluminum molds: a cost-effective step up from steel, reliably producing quality parts in quantities up to the thousands.

✓Hardened steel molds: the standard for high-volume, long-life production tooling.

✓Flexible run sizes: prototype, low-run, and large-run production, without switching partners as your volume grows.

Frequently Asked Questions

What is custom injection molding?

Custom injection molding covers projects that need more than a standard mold and process. It draws on scientific molding, insert molding, multi-shot molding, and overmolding to produce parts with tight tolerances, complex geometry, or multiple materials in a single component.

What is the difference between insert molding and overmolding?

Insert molding places a solid component, often metal, into the tool before resin is injected around it. Overmolding is a two-stage process that molds a second material, usually a soft-touch plastic, over an already-molded rigid part. Both add strength and reduce assembly steps, but they solve different design problems.

Can Crestwood handle parts for medical or military applications?

Yes. We have experience across medical, military, retail, and other regulated industries where components must meet strict compliance requirements and tight specifications.

Have a Complex Part in Mind?

Tell us about your design and we will help you choose the right custom molding process for it.

GET A QUOTE

FDA Registered and Medical Device Manufacturer | ISO 9001:2015 Certified

Custom Injection Molding

Built to Scale With Your Program