Silicone Rubber Overmolding

Silicone rubber overmolding is a process that combines the flexibility and sealing performance of silicone rubber with the strength and rigidity of plastic or metal substrates. The silicone layer is molded directly onto the substrate, creating a strong mechanical or chemical bond.

This process is widely used to achieve waterproof sealing, soft-touch surfaces, vibration damping, and electrical insulation.

Silicone rubber overmolding is a specialized molding process where liquid silicone rubber (LSR) or solid silicone is molded over a rigid plastic or metal substrate to form a single, integrated component.
As a professional silicone rubber overmolding manufacturer, we provide complete services from mold design and tooling to mass production.

Our silicone rubber overmolding process typically includes:

1.Substrate Molding
The plastic or metal substrate is injection molded or prepared in advance.

2.Surface Preparation
The substrate may be treated or primed to enhance silicone adhesion.

3.Silicone Overmolding
Liquid silicone rubber (LSR) is injected over the substrate under controlled temperature and pressure.

4.Curing & Demolding
The silicone cures in the mold, forming a durable overmolded part.

We support LSR overmolding, two-shot molding, and insert transfer overmolding based on product design.

Silicone rubber overmolding offers significant advantages:

✅ Excellent sealing and waterproof performance

✅ Soft-touch and ergonomic feel

✅ High temperature resistance

✅ Chemical and UV resistance

✅ Electrical insulation

✅ Reduced assembly and secondary processes

This makes it ideal for high-performance and harsh-environment applications.

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