Liquid Silicone Rubber Waterproof Gasket Sheath

Unlike gasket sheaths manufactured from conventional organic rubber, our LSR waterproof gasket sheaths retain excellent elasticity, sealing performance, and resistance to environmental degradation after long-term exposure to water, ozone, UV radiation, and extreme temperature fluctuations. They are engineered to fit precisely over pre-formed gaskets or directly enclose component interfaces, providing an extra layer of waterproof protection while preventing gasket extrusion, abrasion, and chemical contamination. We produce all our LSR products in strict accordance with documented quality management processes, supporting both standard component designs and custom specifications to match unique application requirements.

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Technical Specifications

Material Properties

Our liquid silicone rubber waterproof gasket sheaths are produced from 100% high-molecular-weight addition-cured liquid silicone rubber, with no added fillers that compromise long-term performance. Key material properties include:

This addition-cured LSR formulation is free of nitrosamines, phthalates, and heavy metals, meeting basic regulatory requirements for low-volatility applications.

Physical Performance

All performance values are tested under standard laboratory conditions; actual performance may vary slightly based on custom hardness and formulation requirements.

Process Parameters

For custom molded LSR gasket sheaths produced by 橡楚（湖北）橡胶有限公司:

• Minimum wall thickness: 0.5mm
• Maximum continuous length (for extruded profiles): 1200mm
• Tolerance standard: ±0.1mm for dimensions ≤50mm; ±0.2mm for dimensions 50–200mm
• Surface finish options: Matte, semi-gloss, and gloss
• Secondary processing: Cut-to-length, hole punching, adhesive backing, and flash trimming available

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Product Advantages

1. Superior long-term waterproof performance

Our LSR waterproof gasket sheaths have extremely low water absorption (less than 0.3% after 24 hours of immersion) and retain consistent elastic compression even after long-term exposure to fresh water, salt water, and most mild chemicals. Unlike organic rubber sheaths that harden, crack, or shrink after years of water exposure, our LSR formulations maintain sealing force to prevent water intrusion, making them ideal for long-term outdoor and underwater applications.

1. Wide service temperature range for extreme environments

With a continuous service temperature range of -40°C to +200°C, these gasket sheaths retain elasticity and sealing performance in both frozen high-altitude environments and high-temperature industrial applications. They do not become brittle in sub-zero conditions or soften and deform at elevated temperatures, providing consistent sealing performance across changing seasonal and operating conditions.

1. Customizable design for complex geometries

Liquid silicone rubber injection molding enables high-precision production of gasket sheaths with complex cross-sections, curved profiles, and tight tolerances that cannot be achieved with conventional compression molding. We can produce custom gasket sheaths to match any unique component interface requirement, from small electronic device enclosures to large industrial equipment connections.

1. Non-toxic, low-volatility formulation options

We offer food-contact compatible and general industrial LSR formulations. Our addition-cured process eliminates residual peroxide byproducts common with condensation-cured silicone, resulting in low odor, low volatility, and no contamination to sensitive enclosed components, making them suitable for use in drinking water systems, food processing equipment, and consumer electronics.

1. Excellent aging and weather resistance

LSR inherently resists UV radiation, ozone, and atmospheric aging, so our gasket sheaths do not crack, discolor, or lose sealing performance after years of outdoor exposure. This extended service life reduces maintenance frequency and replacement costs for long-term installations.

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Applications

Liquid Silicone Rubber waterproof gasket sheaths from 橡楚（湖北）橡胶有限公司 are used across a wide range of industrial and commercial applications, including:

• Outdoor electronic equipment: Waterproof sealing for junction boxes, LED lighting fixtures, solar panel connectors, outdoor surveillance camera enclosures, and 5G communication base station components, preventing rain and moisture intrusion to extend component service life.
• **Marine and shipbuilding equipment: Sealing for porthole connections, underwater sensor enclosures, deck equipment interfaces, and marine cable joints, resisting salt water corrosion and long-term underwater immersion.
• **Food and beverage processing equipment: Gasket protection for pipeline connections, valve seats, food storage tank interfaces, and beverage filling equipment, with non-toxic LSR formulations compatible with indirect food contact and repeated high-temperature cleaning.
• **Medical device and pharmaceutical equipment: Waterproof protection for diagnostic equipment seals, medical device enclosure interfaces, and pharmaceutical processing equipment, compatible with repeated high-temperature and autoclave sterilization processes.
• **Automotive and new energy vehicles: Sealing protection for battery pack connectors, exterior light seals, door and window interfaces, and charging port components, resisting automotive fluid splashes and extreme temperature fluctuations.
• **Building and construction: Waterproof sealing for curtain wall joint connections, window and door perimeters, and prefabricated construction component interfaces, resisting UV aging and outdoor weathering.

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Selection Guide

Hardness Selection

The appropriate hardness for your gasket sheath depends on your application’s compression requirement and environmental conditions:

• 30–40 Shore A: Best for applications requiring high compression and conformability, suitable for irregular interfaces with large tolerance variations, providing excellent sealing under low clamping force.
• 40–60 Shore A: General-purpose hardness for most static and mild dynamic sealing applications, balancing elasticity and compression resistance for most waterproof sealing use cases.
• 60–80 Shore A: Designed for high-pressure applications and dynamic sealing environments, providing high mechanical strength and resistance to extrusion and deformation under high clamping force.

Size Specifications

We support both standard stock sizes and fully custom size production:

• Standard stock gasket sheaths are available for common rectangular and circular interface sizes, with fixed dimensions available on request.
• For custom sizes, we require detailed 2D CAD drawings or 3D model files to match your specific interface dimensions, including inner diameter, outer diameter, cross-section shape, and any required cutouts or mounting features.
• For large continuous sealing applications, we can produce extruded LSR gasket sheath profiles cut to your required length.

Material Grade

Select the appropriate LSR material grade based on your application requirements:

• General industrial grade: Suitable for general outdoor sealing, electronic equipment, and construction applications, offering reliable performance at a competitive cost.
• Low-volatility food-contact grade: Suitable for food processing equipment, drinking water systems, and consumer products that require low leaching and non-toxic performance.
• High-temperature resistant grade: Suitable for continuous high-temperature industrial applications and applications requiring repeated sterilization, with optimized compression set performance at elevated temperatures.

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Quality Assurance

橡楚（湖北）橡胶有限公司 operates a strict quality management system certified to ISO 9001, covering every stage of raw material inspection, in-process production testing, and final finished product inspection to ensure every batch of LSR waterproof gasket sheaths meets the specified performance requirements. Our raw material suppliers are vetted for consistent quality, and every batch of incoming LSR material is tested for hardness, specific gravity, and curing performance before production. During production, we conduct regular dimensional and visual inspections to identify and correct deviations early, and 100% of finished products undergo a final visual inspection and dimensional check before shipment. For custom batches, we can provide material test reports and performance inspection documentation upon request.

If you have questions about product selection, custom specifications, or pricing, please contact us at:

• Address: 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号
• Phone: 18071171144
• Email: churubber@163.com