This liquid silicone rubber buffer sealing ring adopts high-resilience formula design, with excellent compression set resistance, cushioning and shock absorption effect, and waterproof sealing performance. It can withstand extreme temperature environments for a long time, suitable for dynamic and static sealing needs of various industrial equipment, and its service life is much longer than ordinary rubber seals.
Material
Industrial LSR
Hardness
Shore A 40-70
Temperature
-60°C ~ +230°C
Colors
Black, White, Transparent, Customizable
Certifications
Applications
# Wear-resistant Liquid Silicone Rubber (LSR) Buffer Sealing Ring
The Wear-resistant Liquid Silicone Rubber Buffer Sealing Ring is a high-performance elastomeric component engineered to deliver simultaneous sealing integrity and impact absorption across extreme operating environments. Manufactured via precision injection molding of medical-grade, industrial-grade, or food-grade liquid silicone rubber, this product addresses the limitations of traditional EPDM, nitrile rubber (NBR), and fluororubber sealing solutions, which often suffer from premature wear, temperature-induced degradation, and poor rebound resilience under repeated dynamic loading.
Core features of the product include a self-lubricating modified LSR formulation that reduces surface friction by 40% compared to standard silicone, a precision-molded concentric tolerance of ±0.02mm for gap-free sealing, and a customizable cross-sectional profile (O-ring, D-ring, X-ring, or custom ribbed design) tailored to specific assembly requirements. Unlike solid rubber gaskets, this LSR buffer sealing ring maintains consistent compression set resistance even after 1,000+ hours of dynamic operation, making it ideal for applications requiring both long-term sealing reliability and shock mitigation. It is compatible with aqueous media, weak acids and bases, silicone oils, and most food-grade cleaning agents, with optional secondary coating treatments available for enhanced chemical resistance to harsh solvents.
All formulations are based on two-part addition-cure liquid silicone rubber with a platinum curing system, free of peroxides, heavy metals, and volatile organic compounds (VOCs). Standard material properties are as follows:
The product’s mechanical properties are validated per ISO 3302 (rubber product tolerances) and ASTM D2000 (standard classification system for rubber products in automotive applications):
All buffer sealing rings are produced via high-precision liquid silicone injection molding with the following process controls to ensure batch consistency:
The modified LSR formulation incorporates microscale polytetrafluoroethylene (PTFE) and fluorosilicone additives, which reduce surface friction by up to 51% compared to standard silicone and 32% compared to NBR. In 1 million cycle dynamic wear tests under 0.5 MPa contact pressure, the wear rate of the sealing ring is ≤0.02g/1000h, delivering a 3–5x longer service life than conventional rubber sealing components. This eliminates frequent maintenance and replacement costs in high-cycle dynamic applications.
Unlike rigid plastic seals or non-resilient rubber gaskets, this product combines a sealing lip precision-molded to zero flash with a high-rebound buffer core that absorbs up to 65% of impact energy from repeated mechanical vibration, pressure spikes, or assembly misalignment. It maintains a consistent 0.1–0.3 MPa contact pressure against mating surfaces across its full operating temperature range, preventing leakage even when subjected to 20% temporary overpressure or 1mm of radial misalignment.
The LSR base material exhibits inherent stability across a wide temperature range, with no brittleness at -60°C and no softening or permanent deformation at up to 240°C for modified grades. It is resistant to UV radiation, ozone, and weathering, with zero performance degradation after 500 hours of accelerated UV aging testing. Unlike NBR, it does not swell in contact with silicone oils, glycols, or food-grade grease, making it suitable for outdoor, food processing, and aerospace applications.
The product is available in multiple material grades tailored to strict regulatory requirements, including FDA 21 CFR Part 177.2600 compliance for food contact, ISO 10993-5 biocompatibility for medical devices, and RoHS 2.0 compliance for consumer electronics. Optional secondary treatments such as plasma coating, PTFE spraying, or self-lubricating impregnation can be added to enhance chemical resistance to aromatic solvents, hydraulic oils, and alkaline cleaning solutions.
Widely used in battery pack cooling circuit interfaces, charging port sealing assemblies, and suspension component buffer joints. The wear-resistant grade withstands repeated plugging/unplugging of charging connectors (≥10,000 cycles) and absorbs vibration from road surfaces, preventing coolant leakage and protecting sensitive battery electronics from impact damage. Its temperature stability supports operation in both cold-climate (-40°C) and high-temperature under-hood (180°C) environments.
Installed in filling machine nozzles, conveyor system buffer joints, and sterilization equipment sealing interfaces. Food-contact grades comply with FDA and EU 1935/2004 standards, withstanding repeated high-temperature (121°C) autoclave sterilization cycles without leaching or deformation. The low-friction surface reduces product adhesion during filling operations, while the buffer layer minimizes equipment wear from repeated actuation.
Used in surgical instrument actuation seals, respirator valve buffer seals, and wearable medical device interface gaskets. Medical grades are biocompatible, latex-free, and resistant to common medical disinfectants (isopropyl alcohol, hydrogen peroxide, chlorine-based solutions). The buffer design reduces patient discomfort in wearable applications and prevents fluid leakage in diagnostic equipment.
Suitable for pneumatic cylinder rod seals, automation equipment buffer joints, and valve stem sealing assemblies. The wear-resistant formulation supports up to 1 million actuation cycles at 0.8 MPa operating pressure, with the buffer layer absorbing pressure spikes that would otherwise cause premature seal failure. Its low compression set eliminates leakage after long periods of static storage.
Standard sizes are available for inner diameters ranging from 2mm to 500mm, with cross-sectional thicknesses from 1mm to 20mm. Custom sizes and profiles (D-ring, X-ring, ribbed buffer structure) are available upon request. When selecting dimensions, ensure a 10–15% radial compression ratio for static sealing applications and 8–12% for dynamic applications to balance sealing performance and wear life. For buffer-only applications, a 20–25% compression ratio is recommended to maximize impact absorption.
All Wear-resistant Liquid Silicone Rubber Buffer Sealing Rings are manufactured in an ISO 9001:2015 certified facility, with IATF 16949 certification available for automotive-grade products. Each production batch undergoes a three-stage quality control process: incoming material testing (including Fourier-transform infrared spectroscopy (FTIR) validation of LSR formulation and additive content), in-process inspection (dimensional verification of 10% of units per mold cavity, compression set testing of 5 units per batch), and final performance testing (leakage testing under 1.5x rated operating pressure, wear cycle testing for 10,000 cycles on 0.1% of batch units).
Certification documents, including material test reports (MTRs), compliance certificates for FDA, RoHS, REACH, and biocompatibility reports for medical grades, are provided with every order. We offer a 12-month warranty against manufacturing defects, with custom performance warranties available for high-volume application-specific orders upon request. For products failing to meet stated specifications, we provide full replacement or refund in accordance with our quality assurance policy.
