China Rubber Overmolding: Custom LSR Overmolding Manufacturing

Rubber Overmolding in China: What It Is

Rubber overmolding is the process of molding a rubber or liquid silicone rubber (LSR) layer directly onto a rigid substrate — typically plastic, metal, or FPC. The result is a single component that combines the structural strength of the substrate with the sealing, grip, and durability of rubber. For B2B buyers sourcing from China, overmolding offers a proven way to produce sealed, durable parts at competitive unit costs.

Overmolding Processes We Offer

LSR Overmolding

Liquid silicone rubber overmolding is the standard for high-precision, high-volume parts. LSR bonds to inserts during molding, producing tight-tolerance seals and components. See our liquid silicone injection molding capability.

Silicone Over Plastic

We overmold silicone onto plastic substrates to combine rigidity with a soft, sealing surface — common for connectors, housings, and grips. See our silicone over plastic manufacturing.

Silicone Over Metal

For parts requiring structural strength with a flexible sealing layer, we overmold silicone onto metal inserts. See our silicone over metal manufacturing.

Silicone Over FPC

Flexible printed circuits can be overmolded with silicone for waterproof, durable electronic assemblies. See our silicone over FPC solutions.

Typical Applications

• Connector seals — overmolded sealing around electrical connectors for water and dust protection.
• Gaskets and seals — bonded silicone seals for enclosures and housings.
• Grips and handles — soft-touch overmolding for tools and equipment.
• Sensor and camera housings — sealed protection for electronic assemblies.

Why Source Rubber Overmolding from China

China has the tooling, materials, and manufacturing scale for rubber overmolding. Working with a manufacturer that provides DFM support before tooling helps you avoid cost surprises and rework. SiliconePlus provides tooling and DFM from prototype through mass production, with 25+ years of experience in custom silicone manufacturing.

How to Choose a Rubber Overmolding Manufacturer

• DFM review before tooling — the manufacturer should flag draft angles, wall thickness, and gate placement before cutting steel.
• Overmolding experience — ask for proven parts over plastic, metal, or FPC, not just compression-molded parts.
• Sample lead time — a clear path from prototype to mass production.
• Quality inspection — dimensional, hardness, and tensile testing before shipment.

SiliconePlus Manufacturing Capabilities

SiliconePlus specializes in LSR injection molding and silicone overmolding over plastic, metal, and FPC, plus precision silicone parts and sealing components. We support OEM and ODM projects with tooling and DFM, from prototype to mass production. Send your drawing or 3D file for a DFM report and a quote. For sample policy details, see our sample policy.