OVERMOLDING & 2K INJECTION MOLDING

For Multi-Material & Dual-Color Parts

Sunpeakmold specializes in overmolding and 2K (two-shot) injection molding — combining multiple materials or colors into a single molded part for superior function, aesthetics, and durability.

What Are Overmolding & 2K Molding?

Two powerful techniques for combining materials — each with its own advantages

Overmolding

Wraps a second material around a pre-molded substrate to add soft-touch, sealing, or decorative features in a single process.

1. Base Part

2. Overmolding

3. Finished Part

2K Injection Molding

Two materials injected in sequence within a single mold cycle — creating dual-color or dual-durometer parts with perfect bonding.

1st shot

Mold Rotates

2nd Shot

Typical Structures & Applications

Common overmolding and 2K molding structures we produce

Soft Grip Overmolding

Seal & Gasket Overmolding

Protective Edge Overmolding

Dual-Color Parts

Multi-Material Functional Parts

Buttons, Seals & Functional Parts

Material Compatibility

We work with a wide range of material combinations, ensuring excellent bonding and long-term durability:

Substrate (Base): ABS, PC, PP, PA (Nylon), POM, PBT, and more
Overmold (Soft): TPE, TPU, TPV, SEBS, and other elastomers
2K Combinations: rigid + rigid (dual-color), rigid + soft (functional)
Bonding Review: We evaluate chemical compatibility and adhesion testing for every new material pair

Industries We Serve

Multi-material molding solutions for diverse industries

Automotive

Consumer Electronics

Medical Devices

Kitchenware & Houseware

Quality Control

Every overmolding and 2K part is inspected for bond strength, dimensional accuracy, and appearance.

Ready to Start Your Multi-Material Project?

Get a quote for your overmolding or 2K molding project today

FAQ

Frequently Asked Questions

What is the difference between overmolding and 2K injection molding?

Overmolding usually molds a second material over a pre-molded base part, while 2K injection molding molds two materials or two colors in one two-shot process using a 2K mold and compatible machine.

What materials can be used for overmolding?

Common material combinations may include hard plastics such as ABS, PC, PP, PA, or PC/ABS with soft materials such as TPE, TPU, or selected elastomers. Final material selection depends on bonding, hardness, function, appearance, and application requirements.

Can you support soft-touch overmolding?

Yes. Soft-touch overmolding can be discussed for handles, grips, buttons, protective edges, seals, and ergonomic plastic parts based on material compatibility and part structure.

What products are suitable for 2K injection molding?

2K injection molding is often suitable for high-volume dual-color or multi-material parts such as buttons, grips, handles, housings, seals, and consumer product components.

How do you check bonding quality in overmolded parts?

Bonding quality can be reviewed through material compatibility, bonding area design, mechanical lock features, visual inspection, peeling review, and bonding strength checks when required.

Can you make overmolded parts based on drawings or samples?

Yes. SunPeak can review 2D drawings, 3D files, samples, material requirements, color requirements, and application details to evaluate overmolding or 2K molding feasibility.

Is overmolding better than secondary assembly?

Overmolding can reduce assembly steps and create integrated multi-material parts for suitable projects, but the best process depends on part design, production volume, material compatibility, tooling budget, and assembly requirements.

How can I get an overmolding or 2K molding quote?

You can send us your 2D drawings, 3D files, samples, material requirements, color requirements, expected quantity, and application details. Our team will review the project and provide a quotation.

Get a Free Injection Molding Consultation

Share your project details, 3D files, or requirements. Our engineering team will respond within 24 hours with a professional solution.