Why Do Silicone Overmolded Parts Fail Waterproof Testing?
Silicone overmolding is widely used for waterproof protection in automotive electronics, EV components, sensors, wearable devices, and consumer electronics.
By combining silicone with plastic, metal, or FPC substrates, manufacturers can create integrated components with flexible sealing performance.
However, some silicone overmolded parts may fail waterproof testing after assembly or during product validation.
Common symptoms include:
• Water leakage during pressure testing
• Moisture entering protected areas
• Reduced sealing performance after aging tests
• Failure after temperature cycling
Waterproof problems usually come from design, tooling, material bonding, or process control issues.
