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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.

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About Us

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 (plastic or metal) to add soft-touch, sealing, or decorative features in a single process.

1. Base Part
Hard plastic substrate

2. Overmolding
Soft material overlay

3. Finished Part
Integrated product

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.

  • Material Bond Strength Test (Pull / Peel)
  • Dimensional Inspection (CMM + Manual)
  • Color Match & Appearance Check
  • Soft-Hard Material Adhesion Test
  • Functionality Test (Sealing / Grip)
  • Batch Sampling & Full Inspection Options

Ready to Start Your Multi-Material Project?

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

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FAQ

Frequently Asked Questions

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.
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.
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.
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.
Bonding quality can be reviewed through material compatibility, bonding area design, mechanical lock features, visual inspection, peeling review, and bonding strength checks when required.
Yes. SunPeak can review 2D drawings, 3D files, samples, material requirements, color requirements, and application details to evaluate overmolding or 2K molding feasibility.
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.
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.

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

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