The primary functions and application scenarios of liquid silicone with plastic borders

Liquid silicone rubber overmolding (LSR overmolding) is a composite technology that involves encapsulating liquid silicone rubber onto plastic substrates through injection molding. This process leverages the high elasticity, temperature resistance, and biocompatibility of silicone rubber, combined with the structural strength and design flexibility of plastic, to achieve comprehensive performance unattainable with single materials.

Primary function:

Sealing and Waterproofing: The silicone component forms a flexible sealing ring, providing dustproof and waterproof functions (commonly found in IP67/IP68-rated products), such as smartwatches and outdoor lighting fixtures.

Enhance grip experience: The soft touch and anti-slip properties of silicone improve the comfort of holding tools, wearables, and daily-use items.

Shock absorption and protection: The silicone layer absorbs impacts and safeguards internal electronic components or delicate structures, widely used in sports equipment and device casings.

Aesthetic and Functional Integration: Achieve color contrast or transparent design through two-shot injection molding while integrating functional components such as buttons and seals, reducing assembly processes.

Safety and Weather Resistance: Silicone exhibits strong resistance to extreme temperatures (-50°C to 200°C) and chemical stability, making it suitable for automotive components, kitchenware, and similar environments.

Scope of application:

Consumer electronics: smartphone bezels, smartwatch straps, headphone cases, waterproof charging ports.

Automotive industry: In car buttons, sealed wire harness connectors, interior touch panels.

Equipment: respiratory mask, handheld device casing, contact parts.

Home goods: high-end kitchenware handles, waterproof electric toothbrushes, baby product bite points.

Industrial accessories: shock resistant remote control, sealed connector, corrosion-resistant tool grip.

This technology achieves a balance between lightweight, durability, and user experience through complementary materials, and has become one of the core processes in the design of high value-added products.