Liquid Silicone Rubber Seal For Avionics

Located at 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, our production facility specializes in custom LSR products, with dedicated process control for aerospace-grade sealing components. Our avionics LSR seals address core challenges faced by avionics system integrators: preventing moisture, dust, fuel vapor, and hydraulic fluid ingress while maintaining electrical insulation properties and mechanical resilience over the service life of aircraft electronic systems. Unlike generic rubber seals, our LSR avionics seals are formulated to retain elasticity and sealing force after thousands of hours of thermal cycling, resisting permanent compression set that causes premature seal failure in critical avionics components.

Technical Specifications

Material Properties

Our avionics LSR seals are manufactured from addition-cure liquid silicone rubber formulated specifically for aerospace electronic applications. Key material properties are outlined below:

Physical Performance

Process Parameters

Our liquid injection molding (LIM) process for avionics seals adheres to the following controlled manufacturing parameters:

• Cure temperature: 160°C to 180°C
• Cure time: 90 to 180 seconds (adjusted for seal cross-section)
• Post-cure: 4 hours at 150°C to eliminate residual volatiles
• Tolerance: As per ISO 3302-1 M2 (custom tolerances available for high-precision applications)
• Surface finish: 0.8 to 3.2 μm Ra, as required by application

Product Advantages

1. Unmatched Thermal and Environmental Stability

Unlike organic rubber materials that degrade or harden at extreme low or high temperatures, our platinum-cured LSR retains consistent elasticity and sealing force across the full -60°C to +200°C operating range common in aircraft avionics bays. The material resists degradation from ozone, UV radiation, and atmospheric aging, with no significant change in hardness or compression set after 1000 hours of accelerated aging testing, ensuring long-term reliability in unconditioned avionics compartments.

1. Low Volatility and Clean Molding for Electrical Applications

Our avionics-grade LSR formulation produces seals with extremely low volatile content, eliminating the risk of outgassing that can contaminate sensitive optical sensors, connector pins, and electronic circuit boards. The platinum-cure process produces no corrosive byproducts, so the seal will not cause corrosion of metal components or degrade insulating materials in avionics assemblies over time. This meets the strict low-outgassing requirements for sealed electronic enclosures in aircraft.

1. Custom Precision Molding for Complex Avionics Geometry

Using liquid injection molding (LIM) technology, we can produce avionics seals in custom sizes and complex cross-sections with tight tolerances to fit a wide range of avionics components, from small connector seals to large equipment enclosure gaskets. Our production process ensures consistent part-to-part uniformity for high-volume orders, with no flash or blemishes that could compromise sealing performance.

1. Compliant with Aerospace Safety Standards

All our avionics LSR seals are formulated to meet FAR 25.853 flammability requirements for aircraft interior components, with low smoke emission and no halogenated additives that would produce toxic fumes in the event of a fire. This makes our seals suitable for use in both cabin and airframe-mounted avionics systems.

Applications

Our Liquid Silicone Rubber Seals for Avionics are designed for use in a wide range of aircraft avionics and related aerospace applications, including:

• Avionics Enclosure Seals: Sealing for line replaceable units (LRUs), flight control computers, navigation systems, and communication equipment enclosures, preventing dust and moisture ingress in unpressurized and pressurized avionics bays.
• Connector and Cable Gland Seals: Static and dynamic sealing for electrical connectors, cable glands, and bulkhead feedthroughs, maintaining electrical insulation integrity while preventing fluid ingress into connector assemblies.
• Sensor Housing Seals: Sealing for air data sensors, altitude sensors, inertial measurement units (IMUs), and GPS antenna housings, providing environmental protection without interfering with signal transmission.
• Cockpit Electronic System Seals: Sealing for flight displays, control panels, and cockpit instrument clusters, resisting aircraft cleaning chemicals and UV exposure while maintaining a tight seal against cabin humidity.
• Engine-mounted Avionics Seals: Sealing for engine electronic control units (FADEC) and engine monitoring sensors, where continuous exposure to elevated temperatures and hydrocarbon vapors requires a resistant, durable sealing solution.

Selection Guide

Hardness Selection

Choosing the correct hardness for your avionics seal depends on the application and assembly requirements:

• 30–40 Shore A: Ideal for static seals with large gap variation, or applications requiring high conformability to uneven mating surfaces (e.g., large enclosure gaskets).
• 40–55 Shore A: The most common general-purpose hardness for most avionics connector and enclosure seals, balancing compression set resistance, sealing force, and ease of assembly.
• 55–70 Shore A: Suitable for dynamic sealing applications, or seals that require high resistance to extrusion and high pressure differentials (e.g., pressure-sealed avionics enclosures).

Size Specifications

All our avionics LSR seals are custom-manufactured to match your component's dimensional requirements. We support:

• Circular O-ring seals from 5mm inner diameter to 500mm outer diameter, with cross-sections from 1mm to 10mm.
• Custom-shaped gaskets and seal profiles for non-standard avionics enclosure and component geometries.
• We can manufacture seals to your existing drawing, or provide design support to optimize seal cross-section and sizing for your specific application requirements.

Material Grade

We offer two standard material grades for avionics LSR seals:

• Standard Avionics Grade: Formulated for general avionics applications with operating temperatures up to 200°C, meeting all standard flammability and low outgassing requirements. Suitable for most cabin and airframe-mounted avionics systems.
• High-temperature Grade: Formulated for continuous operation up to 220°C, with enhanced resistance to hydrocarbon exposure for engine-mounted and under-wing avionics applications.

Quality Assurance

橡楚（湖北）橡胶有限公司 maintains a full quality management system certified to ISO 9001, with rigorous quality control processes implemented at every stage of production, from raw material incoming inspection to final part testing before shipment. Each batch of avionics LSR seals undergoes dimensional inspection, visual inspection for molding defects, and verification of key material properties (hardness, compression set, volatile content) to ensure compliance with our specifications and your requirements.

We maintain full batch traceability for all products, with raw material lot records and production documentation retained for the lifetime of the product. For customers requiring additional testing or documentation, we can provide material test reports (MTRs) and process certification to support your system qualification requirements.

For inquiries about custom Liquid Silicone Rubber Seals for Avionics, contact us at:

• Phone: +86 18071171144
• Email: churubber@163.com
• Address: No. 54, Neihe Lane, Fankou Street, Economic Development Zone, Echeng District, Ezhou City, Hubei Province, China