Custom LSR seal ring designed for power connectors, with excellent waterproof, dustproof, high and low temperature resistance, and aging resistance properties. It effectively resists erosion from complex outdoor working conditions, ensures the stability and safety of power connections, and fits various specifications of power connectors.
Material
Industrial LSR
Hardness
Shore A 50-70
Temperature
Certifications
Applications
-60°C ~ +200°C
Colors
Black, White, Transparent, Customizable
# Liquid Silicone Rubber (LSR) Seal Ring for Power Connectors
Liquid Silicone Rubber (LSR) seal rings for power connectors are high-performance sealing components engineered to address the extreme environmental, electrical, and mechanical demands of power transmission and distribution systems. As a critical interface between connector housings, mating contacts, and external environments, these seals eliminate ingress of moisture, dust, chemical contaminants, and mechanical stress that can lead to electrical arcing, corrosion, insulation failure, or unplanned power outages.
Manufactured via precision injection molding of medical and industrial-grade two-part liquid silicone, these seals offer consistent dimensional accuracy even for complex, miniature, or custom connector geometries. Unlike traditional rubber seals (EPDM, nitrile rubber), LSR power connector seals maintain stable performance across a wide temperature range, resist UV radiation and weathering, and deliver long-term elastic recovery to preserve sealing integrity through thousands of mating cycles and decades of field deployment. Core selling points include UL 94 V-0 flame retardancy, compliance with IEC 60529 IP68 ingress protection standards, and compatibility with high-voltage (1kV–500kV) power connector designs.
Unlike EPDM or nitrile rubber seals that degrade after 3–5 years of outdoor exposure, LSR power connector seals resist UV radiation, ozone, and temperature fluctuations for 10+ years of maintenance-free operation. The low compression set ensures consistent sealing force even after decades of compressed installation, eliminating the need for periodic seal replacement in remote or hard-to-access power infrastructure.
The high dielectric strength and tracking resistance of LSR prevent electrical creepage and arcing between connector contacts, even in high-humidity or salt-contaminated coastal environments. UL 94 V-0 flame retardancy ensures the seal will self-extinguish in the event of electrical overheating, reducing fire risk in enclosed power distribution cabinets and underground vaults.
Liquid silicone’s low viscosity during injection molding allows for high-precision replication of intricate seal geometries, including micro-grooves, dual-lip sealing edges, and integrated alignment features, with zero flash or burrs that could interfere with connector mating. This makes the seals suitable for next-generation miniaturized high-voltage connectors used in renewable energy and electric vehicle infrastructure.
LSR seals show minimal swelling or degradation when exposed to transformer oil, diesel, dilute industrial chemicals, and salt spray, making them suitable for use in offshore wind farms, oil and gas power facilities, and chemical plant power distribution systems. Unlike fluororubber seals, LSR remains flexible at low temperatures, preventing brittle cracking in cold climate power grids.
These seals are the standard sealing solution for medium-voltage (10kV–35kV) and high-voltage (110kV–500kV) overhead line connectors, underground cable junction boxes, and substation disconnect switch connectors. They ensure IP68 ingress protection to prevent water and dust ingress that can cause cable insulation failure and unplanned outages.
In solar photovoltaic (PV) power plants, the seals are used in string connectors, combiner box connectors, and inverter power interfaces, where they resist extreme temperature fluctuations in desert and high-altitude environments, as well as long-term UV exposure. For offshore wind turbines, they seal nacelle power connectors and underwater cable connectors, resisting salt spray corrosion and hydraulic oil exposure.
The seals are widely used in EV high-voltage battery pack connectors, on-board charger (OBC) interfaces, and DC fast charging plugs. Their high-temperature resistance handles heat generated during fast charging, while the low compression set preserves sealing integrity through thousands of charging cycles. IP69K rated variants are available for charging plugs that require regular high-pressure cleaning.
For industrial automation control cabinets, mining equipment power connectors, and medical device power interfaces, LSR seals deliver reliable sealing in dust-heavy, vibration-prone, or sterile environments. Medical-grade variants meet biocompatibility requirements for patient-connected medical device power connectors.
Standard seal sizes are available for all common IEC 61076 and ANSI C119 power connector form factors, with cross-sectional diameters ranging from 0.8mm to 12mm and outer diameters from 3mm to 300mm. Custom sizes and geometries (including dual-lip seals, seals with integrated alignment tabs, and overmolded seals with plastic or metal inserts) are available upon request, with 3D prototyping support for design validation.
All LSR power connector seals are manufactured in ISO 9001, IATF 16949, and ISO 13485 certified facilities, with strict quality control at every production stage:
The products carry UL Recognized Component certification, CE marking, and comply with RoHS 2.0 and REACH environmental regulations. We offer a 5-year warranty against material and manufacturing defects for standard industrial-grade seals, with extended warranty options available for custom high-reliability applications.
