Xiangchu manufactures and customizes LSR O-ring waterproof seals, with excellent waterproof performance, good sealing stability, temperature and aging resistance. It fits sealing and waterproof requirements for multiple scenarios, supports customization of size and hardness, certified by ISO 9001 with stable reliable quality.
Material
Food-grade LSR
Hardness
Shore A 30-70
Temperature
Certifications
Applications
-40°C ~ +200°C
Colors
Black, White, Transparent, Customizable
# Liquid Silicone Rubber O-ring Waterproof Seal
*Manufactured by 橡楚（湖北）橡胶有限公司*
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Liquid Silicone Rubber (LSR) O-ring waterproof seals are precision-molded static sealing components designed to prevent fluid leakage, block moisture ingress, and maintain reliable pressure resistance across a wide range of operating conditions. As a core product of 橡楚（湖北）橡胶有限公司, our LSR O-ring waterproof seals leverage the inherent benefits of high-purity liquid silicone rubber to deliver consistent long-term performance in demanding sealing applications that require water resistance and environmental stability.
Unlike general-purpose rubber O-rings, our LSR O-ring waterproof seals are manufactured through precision injection molding, which ensures uniform material density, tight dimensional tolerance control, and a defect-free surface finish that supports consistent sealing performance. These seals retain their elasticity and sealing force across extreme temperature fluctuations, resist degradation from long-term water exposure, and meet basic requirements for food contact and medical applications when the appropriate material grade is selected. We produce all our LSR O-rings at our facility 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, with full in-process quality control to ensure every part meets specified performance requirements.
Core selling points of our product include: stable water-proof sealing performance across a wide temperature range, excellent aging resistance for extended service life, customization available for non-standard sizes and material properties, and full compliance with our ISO 9001 quality management system requirements.
Our LSR O-ring waterproof seals are produced from addition-cure food-grade liquid silicone rubber, with the following core material properties:
We offer LSR O-rings in a range of standard hardness grades, with corresponding physical performance parameters as follows:
The non-polar molecular structure of LSR gives our O-rings extremely low water absorption (max 0.8% by weight after 72 hours of immersion), preventing material swelling, degradation, or loss of sealing force that can occur with less inert rubbers after long-term contact with fresh water, tap water, or mild salt water. The uniform injection molding process eliminates internal porosity and surface defects that could create leakage paths, ensuring consistent water blocking for static sealing applications.
Unlike organic rubber seals that harden in low temperatures or soften in high heat, our LSR O-rings retain stable elasticity and compression set resistance from -40°C to 200°C. This makes them suitable for waterproof sealing applications that experience extreme temperature fluctuations, from outdoor cold climate equipment to hot water processing systems.
Addition-cured LSR does not contain plasticizers, heavy metals, or harmful volatile additives, and qualified grades meet basic requirements for indirect food contact and low-irritation medical applications. It resists degradation from common environmental contaminants, ozone, UV exposure, and mild household/industrial chemicals, so it will not crack or leach contaminants even after years of outdoor or wet service.
All our LSR O-rings are manufactured through automated liquid injection molding, which ensures tight dimensional control and uniform material properties across every production run. This consistency reduces installation variation and ensures every O-ring delivers the expected sealing performance, lowering the risk of premature leakage and maintenance costs.
Our Liquid Silicone Rubber O-ring waterproof seals are suitable for static sealing applications across a wide range of industries, including:
*Note: Our LSR O-rings are designed for static and low dynamic reciprocating sealing applications. For high-speed rotating sealing applications, please contact our technical team to discuss specific requirements.*
Choosing the correct hardness is critical for optimal waterproof sealing performance:
We stock a full range of standard ASME and metric size LSR O-rings for common waterproof applications. For non-standard custom sizes, we accept orders for outer diameters up to 600 mm and cross-sections from 0.5 mm to 12 mm. When requesting a custom O-ring, please provide the required inner diameter, outer diameter, cross-section, and tolerance requirements to our sales team for accurate quoting.
We offer two standard material grades for waterproof O-rings:
橡楚（湖北）橡胶有限公司 operates a fully implemented ISO 9001 quality management system, covering raw material incoming inspection, in-process production control, and finished product outgoing testing to ensure every LSR O-ring waterproof seal meets specified performance requirements.
Our quality control process includes:
For all standard and custom orders, we provide a material test report with basic physical performance data upon request. If you have any questions about product performance or quality, please contact us at:
