Liquid Silicone Rubber O-ring Seal Gasket

Unlike general rubber O-rings, our LSR O-ring seal gaskets are produced through injection molding of high-purity liquid silicone rubber, resulting in a consistent, low-porosity structure that delivers superior compression set resistance and thermal stability compared to conventional solid rubber seals. Our products are suitable for both standard and custom sealing requirements, supporting mass production and small-batch custom orders to match specific application needs.

Core selling points of our LSR O-ring seal gaskets include: wide service temperature range, excellent aging resistance, food-safe and medical-compatible material options, low compression set for long-term sealing, and customizable dimensions and hardness to fit unique application requirements.

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Technical Specifications

Material Properties

Our LSR O-ring seal gaskets are manufactured from 100% pure addition-cured liquid silicone rubber, with no recycled filler materials. Key material properties are listed below:

Physical Performance

All our LSR O-ring seal gaskets meet the following standard physical performance parameters (values vary by hardness grade):

Process Parameters

Our standard manufacturing process parameters for LSR O-ring seal gaskets are:

• Injection molding pressure: 8–15 MPa
• Cure temperature: 160–180°C
• Post-cure condition: 4 hours at 150°C to remove volatile components
• Standard dimensional tolerance: GB/T 3692.1 grade M (equivalent to ISO 3302-1 M2), can be adjusted to tighter tolerances for high-precision applications

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Product Advantages

1. Excellent thermal and aging stability

Unlike nitrile rubber (NBR) or ethylene propylene diene monomer (EPDM) seals that degrade rapidly at high temperatures, our LSR O-ring gaskets retain their elasticity and sealing performance after long-term exposure to extreme temperatures and UV radiation. They do not crack, harden, or leach harmful substances in high-temperature environments, making them ideal for long-term use in demanding thermal conditions.

1. Low compression set for long-term sealing reliability

Our platinum-catalyzed addition curing process produces a fully cross-linked silicone structure with extremely low compression set. This means the O-ring gasket retains its original shape and elastic resilience after long-term compression between mating parts, avoiding common seal failure issues such as leakage caused by permanent deformation. The service life of our LSR O-ring gaskets is 2–3 times longer than conventional general rubber gaskets under the same working conditions.

1. High purity and multi-grade compatibility

We offer raw material grades from general industrial to food-contact and medical-grade, all produced without harmful plasticizers or heavy metal additives. Our food-grade and medical-grade LSR O-ring gaskets meet international food safety and biocompatibility standards, making them suitable for use in food processing equipment, medical devices, and drinking water systems.

1. Customizable to meet unique application requirements

We support custom production of non-standard dimensions, special hardness, and functional modified LSR O-ring gaskets (e.g., conductive, heat-conductive, flame-retardant). Our engineering team can adjust product parameters to match your specific sealing needs, whether you need a small batch of prototype seals or mass production for large-scale manufacturing.

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Applications

Our LSR O-ring seal gaskets are widely used across multiple industries for static and low dynamic sealing applications:

• Food and beverage processing equipment: Sealing for food containers, filling machines, coffee makers, water purifiers, and kitchen appliances, where non-toxicity and food safety are required.
• Medical and pharmaceutical industry: Sealing for medical devices, diagnostic equipment, respiratory devices, pharmaceutical processing equipment, and sterile packaging, where biocompatibility and resistance to repeated autoclave sterilization are critical.
• **Automotive industry: Sealing for engine sensors, lighting systems, battery packs in new energy vehicles, and interior trim components, where resistance to temperature fluctuation and weathering is required.
• **Electronics and electrical industry: Sealing for outdoor communication equipment, LED lighting, waterproof connectors, and consumer electronics, providing dustproof and waterproof protection.
• **Household appliance industry: Sealing for water heaters, air conditioners, washing machines, and small kitchen appliances, providing long-term reliable sealing resistance to hot water and daily wear.
• **Industrial equipment: Sealing for hydraulic systems, pneumatic equipment, and pumps operating in low-temperature or high-temperature environments, where conventional rubber seals cannot meet performance requirements.

Note: LSR O-ring seal gaskets are not recommended for continuous use in high-concentration petroleum-based oils, fuels, or strong organic solvents, as these will cause swelling and performance degradation. For these applications, please contact our team to discuss alternative material options.

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Selection Guide

Hardness Selection

The hardness of the LSR O-ring gasket should be selected based on your working pressure and installation space:

• 30–40 Shore A: Suitable for low-pressure sealing applications and applications requiring high compression elasticity, such as small precision electronic components and soft sealing interfaces.
• 45–60 Shore A: General purpose hardness for most static sealing applications, suitable for most industrial equipment, household appliances, and automotive components, balancing elasticity and compression resistance.
• 65–80 Shore A: Suitable for high-pressure sealing applications and scenarios requiring high deformation resistance, such as hydraulic equipment and large mechanical interfaces.

Size Specifications

We produce standard metric and inch LSR O-rings matching global standard sizes, as well as custom non-standard sizes per customer drawings. The standard cross-section diameter range we produce is 0.5mm to 20mm, and the inner diameter range is 1mm to 500mm. For sizes outside this range, please contact our sales team to discuss feasibility. When selecting a size, please confirm the inner diameter, cross-section diameter, and required tolerance level to ensure proper fit with your mating parts.

Material Grade

• General industrial grade: Suitable for general industrial sealing applications that do not require direct contact with food or human tissue, with a cost-effective price.
• **Food-contact grade: Complies with FDA 21 CFR 177.2600, suitable for food processing equipment, drinking water systems, and kitchen appliances.
• **Medical grade: Complies with USP Class VI biocompatibility requirements, suitable for medical devices and pharmaceutical processing, and can withstand repeated high-temperature sterilization.

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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, and every batch of LSR O-ring seal gaskets undergoes full quality inspection before delivery, including dimensional checks, visual appearance inspection, hardness testing, and compression set sampling testing. We maintain complete production and inspection records for each batch to ensure consistent product quality that meets agreed specifications.

If you have any questions about product selection, customization, or technical support, please contact us:

• 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: +86 18071171144
• Email: churubber@163.com

We welcome inquiries for standard products and custom development projects to match your specific sealing requirements.