Liquid Silicone Rubber High and Low Temperature Resistant Shock Absorbing Waterproof Sealing Parts for New Energy Vehicles

Product Overview

Our Liquid Silicone Rubber (LSR) High and Low Temperature Resistant Shock Absorbing Waterproof Sealing Parts are engineered specifically to address the extreme operational demands of new energy vehicle (NEV) systems, delivering reliable long-term performance across 100+ application scenarios in battery packs, electric drive units, charging interfaces, and body electronics. As a critical safety and performance component for NEVs, these parts integrate four core functions: temperature resistance, shock absorption, waterproof sealing, and environmental stability, solving common industry pain points such as seal failure under thermal cycling, water ingress in high-pressure car washes, and structural loosening caused by long-term road vibration.

Manufactured via precision injection molding of medical and automotive-grade liquid silicone raw materials, these parts feature a homogeneous molecular structure with no internal defects, ensuring consistent performance even under 1,000+ hours of continuous exposure to harsh under-hood and under-vehicle conditions. Unlike traditional EPDM or thermoplastic elastomer seals, our LSR sealing parts maintain dimensional stability and elasticity across a wide temperature range, eliminating the risk of brittleness, cracking, or permanent deformation that can lead to NEV performance degradation or safety hazards. Each part is custom-molded to match exact vehicle design tolerances, with an optional secondary coating treatment available for enhanced wear resistance and anti-adhesion properties in high-friction application scenarios.

Technical Specifications

Material Properties

All sealing parts are formulated with 100% pure platinum-catalyzed liquid silicone rubber, free of plasticizers, heavy metals, and volatile organic compounds (VOCs) to comply with global automotive material safety standards.

Physical Performance

The parts are optimized for dynamic load and sealing performance required for NEV road and operational conditions:

Process Parameters

Our precision LSR injection molding process ensures batch consistency and zero manufacturing defects:

Product Advantages

1. Extreme Wide-Temperature Performance Stability

Unlike EPDM seals that lose elasticity below -40°C and experience permanent deformation above 150°C, our LSR parts maintain 95% of their original elasticity and sealing pressure across the full -60°C to 220°C operating range. This makes them ideal for NEV battery packs that experience rapid temperature swings during fast charging, cold-start operations in high-latitude regions, and continuous high-load operation of electric drive units, preventing seal failure that could lead to thermal runaway or battery short circuits.

2. Integrated Shock Absorption and Sealing Function

The unique viscoelastic properties of LSR allow these parts to simultaneously provide long-term compression sealing and dynamic shock absorption, reducing the need for separate sealing and cushioning components in NEV assemblies. When subjected to 100Hz to 2000Hz road vibration common in urban and off-road driving conditions, the parts absorb 40% to 60% of impact energy, protecting sensitive electronic components and preventing seal interface loosening that causes water or dust ingress over time.

3. Superior Long-Term Durability

With a compression set of ≤10% after 1000 hours of high-temperature compression, these parts retain their original sealing pressure for the full service life of the vehicle, eliminating the need for periodic seal replacement common with lower-performance elastomer products. They also exhibit exceptional resistance to automotive chemicals: immersion in 10% sulfuric acid electrolyte, ethylene glycol coolant, and road salt solutions for 1000 hours results in less than 5% change in hardness and dimensional stability, preventing degradation caused by battery leakage or road contaminant exposure.

4. Precision Customization for Complex NEV Geometries

Our LSR injection molding process supports manufacturing of complex, multi-functional sealing parts with integrated positioning features, conductive paths, and multi-hardness composite structures, eliminating secondary assembly steps and reducing overall system cost. We can produce parts with thickness ranging from 0.3mm micro gaskets to 50mm large-format cushion seals, matching the exact design requirements of 100+ different NEV models currently on the market.

Applications

These LSR sealing parts are widely used across all core NEV systems, with 100+ verified use cases across passenger EVs, commercial electric trucks, and electric off-highway vehicles:

1. Power Battery Systems: Perimeter sealing gaskets for battery pack housings, sealing plugs for module cooling lines, cushion pads between battery cells, and vent valve seals, providing IP68 waterproof protection, thermal cycling resistance, and shock absorption to prevent battery damage from road impact.
2. Electric Drive and Powertrain Systems: Sealing rings for motor housings, gasket seals for gearbox covers, and vibration damping pads for inverter assemblies, resisting high temperatures generated by continuous motor operation and preventing oil or coolant leakage.
3. Charging Interface Systems: Sealing gaskets for AC and DC charging ports, sealing caps for charging connectors, and waterproof rings for on-board charger housings, with IP6K9K resistance to high-pressure car washes and wear resistance for 10,000+ plug-in cycles.
4. Body and Electronic Systems: Sealing strips for ADAS sensor housings, waterproof gaskets for battery management system (BMS) enclosures, and cushion seals for high-voltage wiring harness connectors, preventing dust and water ingress that causes sensor malfunction or high-voltage short circuits.
5. Thermal Management Systems: Sealing rings for coolant pipes, gasket seals for chiller units, and vibration damping pads for heat pump components, maintaining leak-free operation across extreme temperature changes in heating and cooling cycles.

Selection Guide

Hardness Selection

• 30–40 Shore A: Recommended for low-pressure sealing applications with irregular mating surfaces, such as sensor housing gaskets and charging port seals, where high elasticity and conformability are required to compensate for minor dimensional deviations.
• 45–60 Shore A: General-purpose hardness suitable for most battery pack seals, cooling line seals, and wiring harness connectors, balancing sealing pressure, shock absorption, and dimensional stability.
• 65–80 Shore A: Designed for high-load structural sealing and cushioning applications, such as battery cell cushion pads and electric drive unit mounting seals, providing high structural support and wear resistance under continuous dynamic load.

Size Specifications

All parts are custom manufactured to customer drawings, with standard reference sizes for common applications:

• Charging port seals: Inner diameter 10mm to 80mm, thickness 1.5mm to 3mm
• Battery pack perimeter seals: Length 800mm to 2200mm, cross-section 5mm × 8mm to 15mm × 20mm
• Cooling line O-rings: Inner diameter 3mm to 50mm, cross-section 1mm to 5mm
• BMS housing gaskets: Custom size up to 400mm × 300mm, thickness 0.3mm to 2mm

For non-standard geometries, we provide free design support to optimize seal cross-section and hardness for your specific application requirements.

Material Grade

• Standard Automotive Grade: Compliant with RoHS 2.0 and REACH regulations, suitable for non-critical body and auxiliary system applications with general temperature and performance requirements.
• Battery Safety Grade: UL94 V-0 flammability rated, with enhanced electrolyte resistance, designed for battery pack internal components and high-voltage system seals to meet NEV fire safety requirements.
• Medical-Grade Variant: USP Class VI certified, non-toxic and odorless, suitable for in-cabin applications such as air conditioning system seals and interior electronic component gaskets.

Quality Assurance

We implement a full-process quality control system from raw material incoming inspection to finished product delivery, ensuring 100% of parts meet customer specifications and industry standards:

1. Incoming Material Control: Every batch of LSR raw material is tested for hardness, tensile strength, and curing performance before entering production, with traceability records maintained for 15 years per automotive industry requirements.
2. In-Process Quality Control: We monitor 100% of molding process parameters (temperature, pressure, curing time) in real time, with hourly sampling for dimensional and hardness testing to ensure batch consistency.
3. Finished Product Testing: Each batch of parts undergoes functional testing including compression set testing, waterproof rating verification, and temperature cycling testing (-60°C to 220°C for 100 cycles) to validate performance. For critical battery system parts, we provide 100% individual visual inspection and air leak testing to eliminate defective products.
4. Certifications: All products comply with IATF 16949 automotive quality management system standards, with third-party certifications including UL94 V-0, RoHS 2.0, REACH, and IP68/IP6K9K rating verification available upon request.

We offer a 5-year quality warranty for all standard parts, with dedicated technical support to assist with installation, performance testing, and custom material formulation development for special application scenarios.