Mold Type

Double Injection Molding — 2K / Two-Shot Molding

Double shot injection molding, also called 2K injection molding or two-shot injection molding, is the process of molding two or more different plastic materials into one part at one time.

What Is It

One part, two materials.

A key part of double shot injection molding is that the two materials must be compatible with each other and designed to overmold — otherwise the product won't hold up during production. Overmolding is sometimes treated as a single type of 2K injection molding, but many overmolding materials aren't suitable for the two-shot process, since one material may need a very different cycle time than the other. Material compatibility is the deciding factor.

The process lets you produce a single part with different regional plastic materials, or mold a single part with multiple independent colors. Applications range from simple household items like power tools to everyday products like toothbrushes.

We run parallel 2K injection molding machines and 90-degree double injection molding machines — covering both double injection molding and overmolding parts.

Process Types

Types of Double Injection Molding

01

Sequential Injection Molding

One material is injected into the mold first, then the second material is injected into it once it has partially solidified. Well suited to products that need different colors or textures.

02

Co-Injection Molding

Two materials are injected simultaneously through different nozzles and meet in the mold cavity, bonding together into one part — used for parts with a core and an outer layer, like a bottle with a soft grip over a rigid base.

03

Sandwich Molding

Two materials are injected into the same cavity but separated by a third "core" material — used for parts with a foam or honeycomb core, such as lightweight composite panels for aerospace.

04

Overmolding

One material is molded directly over another — like a rubber grip over a plastic handle — to create a soft-touch feel or add functionality such as an anti-slip surface.

Our Equipment

Two-Shot & Overmolding, Done Right

We offer two-shot injection molding and overmolding services worldwide, running both parallel 2K injection molding machines and 90-degree double injection molding machines. If you need any type of double injection molding or overmolding parts, contact us — we'll offer you the best quality.

Want to know more about two-shot molding? We're happy to walk you through the details for your specific project.

Our Work

Appliance parts we've molded before.

A sample across categories — not limited to these. Contact us for a price on your specific project.

Start Your Project

Have a part to manufacture? Let's make it production-ready.

Send your drawings, 3D files or project requirements and our team can review the next step.