Custom LSR Overmolded Cable Strain Relief Seal | Waterproof Wire Harness Seal

In this structure, liquid silicone rubber is molded directly onto the specified area of an engineering plastic part or cable outlet region to form an integrated sealing and protection feature.

Compared with separately assembled rubber sleeves or standard grommets, LSR overmolding can help improve positioning accuracy, sealing consistency and assembly efficiency.

This type of solution is commonly used in automotive wire harnesses, EV electronic systems, sensor cable outlets and industrial connector assemblies.

During service, these areas may be exposed to repeated bending, vibration, moisture, dust and temperature cycling. If the cable exit is not properly sealed and supported, long-term failure risks may include leakage, cable movement, wear and unstable assembly performance.

A custom LSR overmolded cable strain relief seal can help provide:

Waterproof sealing around cable entry points

Mechanical strain relief

Vibration resistance

Dust protection

Better assembly repeatability

Reduced need for secondary sealing components

For broader connector sealing applications, you can also review our custom automotive connector silicone seal solutions.

Typical design features may include:

Defined cable exit sealing area

Controlled compression profile

Silicone-to-plastic overmolding boundary

Anti-movement support geometry

Waterproof sealing lips or ribs

Cable stress transition structure

Custom hardness and color options

Drawing-based custom dimensions

For projects involving silicone bonded to engineering plastic structures, you can also review our plastic with silicone overmolding capability page.

Automotive wire harness systems

EV battery and charging cable assemblies

Sensor cable outlet sealing

Automotive control modules

Industrial connector cable entry points

Outdoor electronic equipment

Customization can include cable diameter, sealing profile, compression structure, silicone hardness, substrate geometry, bonding area, waterproof target and assembly conditions.

For similar automotive silicone overmolding projects, you may also browse our automotive silicone overmolding products.

Our team can support design review, sealing structure analysis and custom LSR overmolding development based on your cable entry or wire harness project.