Services

Overmolding Mold

Seamless Soft-Touch and Dual-Material Molding

Overmolding allows thermoplastic elastomers (TPE, TPU, etc.) to be molded over rigid substrates such as ABS, PC, or Nylon. This creates a unified part with soft-touch surfaces or improved sealing, perfect for grips, gaskets, buttons, or medical tools requiring comfort and durability.
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Overmolding is a multi-step injection molding technique that molds one material onto another, typically combining a soft elastomer (such as TPE, TPU, or silicone) with a hard thermoplastic (such as PC, ABS, or nylon). This technique enhances product value through improved ergonomics, waterproofing, shock absorption, and aesthetic design.

At MID Mould, we design and manufacture high-precision overmolding molds optimized for the following applications:

Manual insert or fully automated overmolding
1K + 1K sequential molding using two separate molds
2K rotary or core-pulling configurations for one-piece molding

We support the following overmolding:

Plastic-on-plastic (e.g., PC+TPE, nylon+TPU)
Plastic-on-metal (e.g., metal core, contacts)
Plastic-on-electronics (e.g., sealed sensors or connectors)

To ensure strong bonds between layers, we employ the following:

Material compatibility testing and datasheet review
Surface texturing or preheating
Controlled molding temperature and injection sequence

Typical applications include:

Consumer: toothbrush handles, phone grips
Automotive: knobs, seals, switch covers
Medical: ergonomic tools, waterproof sealed housings

From part analysis to mold development and overmolding trials, we provide comprehensive engineering support to ensure excellent bond strength, part alignment, and aesthetics.