Custom Silicone Overmolded Metal Insert Waterproof Seal

What Is Silicone Over Metal Overmolding?

Silicone over metal overmolding is a custom manufacturing process that combines silicone rubber with metal inserts inside the mold. The metal part is positioned first, and then silicone is molded around selected areas to form a bonded or mechanically locked structure.

This process is often used when a product requires the strength of metal and the flexibility, sealing performance or insulation properties of silicone.

Designed for Waterproof and Protective Sealing

Metal components used in electronics, automotive systems and industrial equipment may require waterproof protection, vibration resistance, insulation or sealing around specific contact areas. A custom silicone overmolded metal insert can help protect the metal part while improving assembly reliability.

The silicone layer can be designed as a sealing edge, protective sleeve, cushioning layer, insulation barrier or anti-slip surface according to the final application.

Key Structure Options

The silicone and metal structure can be customized according to your drawing, assembly method and performance requirements.

Typical structure options include:

• Silicone sealing layer
• Metal insert body
• Bonding area
• Mechanical locking groove
• Waterproof sealing edge
• Insulation protection zone
• Shock absorption area
• Anti-slip silicone surface
• Positioning holes
• Custom thickness and hardness

Key Advantages

• Integrated silicone over metal structure
• Waterproof and dustproof sealing support
• Electrical insulation protection
• Shock absorption and vibration resistance
• Better grip or anti-slip performance
• Stronger assembly stability
• Custom geometry for complex metal inserts
• Reduced secondary assembly steps
• OEM/ODM customization from drawings or samples

Application Areas

This custom silicone overmolded metal insert seal can be used for:

• Automotive sensors
• EV electronic components
• Metal connector parts
• Industrial sealing components
• Waterproof terminal parts
• Electronic module metal inserts
• Charging interface components
• Hardware sealing parts
• Metal pins and sleeves
• Shock-absorbing metal components

Custom Manufacturing Options

SiliconePlus can customize silicone over metal components based on 2D drawings, 3D files, samples, metal insert materials and performance requirements.

Available customization options include:

• Custom metal insert shape
• Custom silicone coverage area
• Custom bonding structure
• Custom silicone hardness
• Custom sealing edge design
• Black, gray, red or custom colors
• Stainless steel, aluminum, brass or custom metal inserts
• LSR injection molding
• Insert molding
• Prototype sampling and mass production
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Engineering Considerations Before Mold Opening

Silicone over metal projects require careful evaluation before tooling. The final bonding result and sealing performance depend on the metal material, surface condition, primer treatment, mechanical locking design, mold positioning and silicone material selection.

Before starting a project, we recommend confirming:

• Metal insert material
• Metal surface treatment
• Silicone bonding area
• Mechanical locking structure
• Required silicone hardness
• Sealing or insulation requirement
• Assembly environment
• Waterproof test target
• Pull force requirement
• Estimated production quantity

Quality Control for Silicone Over Metal Parts

For silicone overmolded metal insert parts, quality control should focus on bonding stability, silicone coverage accuracy, flash control, metal insert positioning, sealing edge consistency and appearance quality.

SiliconePlus can support dimensional inspection, visual inspection, bonding check, pull force test support, waterproof test support and CCD inspection according to project requirements.

Why Choose SiliconePlus?

SiliconePlus focuses on custom silicone overmolding, liquid silicone rubber injection molding and precision silicone parts manufacturing. Our work covers silicone over plastic, silicone over metal, silicone over FPC and waterproof integrated silicone components.

For silicone over metal projects, our engineering team can help review insert positioning, bonding area, mold feasibility, material matching, flash control, demolding risk and mass production stability.

Send Your Silicone Over Metal Project

If you need a custom silicone overmolded metal insert seal, waterproof silicone bonded metal component or LSR overmolded metal part, please send us your 2D drawings, 3D files, samples, metal material information and technical requirements.

Our team will evaluate your project and provide a custom silicone overmolding solution.

Specifications

FAQ

1. What is silicone over metal overmolding?

Silicone over metal overmolding is a custom process that molds silicone rubber onto a metal insert. It combines the strength of metal with the sealing, insulation, cushioning or protective properties of silicone.

2. Can you customize the silicone coverage area?

Yes. We can customize the silicone coverage area according to your metal insert design, assembly method, sealing requirement and functional needs.

3. What metal materials can be used?

Common options include stainless steel, aluminum, brass and other custom metal inserts. The final material should be evaluated according to bonding requirements, molding process and product use environment.

4. Can the product support IP67 or IP68 waterproof design?

We can support IP67/IP68 waterproof sealing design based on your complete product structure. Final waterproof performance should be verified through testing on the finished assembly.

5. What information do you need for quotation?

Please provide 2D drawings, 3D files, samples, metal material, silicone coverage area, hardness requirement, color, quantity and testing requirements.

6. Can you help check the design before mold opening?

Yes. Our engineering team can review insert positioning, bonding area, mechanical locking design, mold feasibility, flash control and mass production stability before tooling.