This product is integrally molded with high-quality liquid silicone, specially designed for cable terminal protection. It has excellent insulation, high and low temperature resistance, UV resistance and aging resistance, effectively isolating moisture, dust and external force damage, greatly improving the stability and safety of power transmission system operation.
Material
Industrial LSR
Hardness
Shore A 50-70
Temperature
Certifications
Applications
-60°C ~ +200°C
Colors
Black, White, Transparent, Customizable
# High Insulation Weather-resistant Liquid Silicone Cable Terminal Sheath
The High Insulation Weather-resistant Liquid Silicone Rubber (LSR) Cable Terminal Sheath is a high-performance protective component injection-molded from medical and industrial-grade liquid silicone rubber, purpose-built to seal, insulate, and protect exposed cable terminals, connector interfaces, and conductor crimping points in low, medium, and high-voltage power systems. As a critical upgrade from traditional PVC, EPDM, or heat-shrink protective sleeves, this LSR sheath leverages the inherent high-performance characteristics of liquid silicone to eliminate common failure points of conventional terminal protection solutions, including cracking under temperature fluctuations, insulation degradation under UV exposure, and seal failure caused by moisture intrusion.
Core selling points of the product include a dielectric strength of up to 28 kV/mm, an operating temperature range spanning -60°C to +220°C, UL 94 V-0 flammability rating for fire-prone installation scenarios, and a 30+ year service life in outdoor exposed environments. Each sheath is precision-molded to match the dimensional profile of standard cable terminals (including copper lugs, aluminum connectors, and pre-insulated terminals) and can be customized for non-standard connector geometries, eliminating the need for on-site cutting or adjustment during installation. Unlike heat-shrink alternatives, this LSR sheath requires no heating tools for assembly: its high elastic resilience allows it to stretch up to 400% of its original inner diameter to fit over terminal assemblies, then contract tightly to form a seamless, IP68-rated waterproof seal without adhesives or additional fasteners.
The sheath is formulated from two-component, platinum-catalyzed addition-cure liquid silicone rubber with no volatile organic compounds (VOCs), low molecular weight siloxanes, or corrosive additives, making it compatible with copper, aluminum, and polymer cable insulation materials without causing contact corrosion or insulation aging. Key material properties include:
The finished sheath exhibits consistent mechanical and electrical performance across its entire operating lifecycle, with critical performance metrics as follows:
For customized sheath orders, the LSR injection molding process adheres to the following controlled parameters to ensure consistent part quality:
Unlike PVC or EPDM sleeves, which experience a 30-50% drop in dielectric strength after 10 years of outdoor exposure due to plasticizer migration and polymer chain degradation, this LSR sheath retains >95% of its original insulation performance after 30 years of UV exposure, temperature cycling, and moisture contact. Its low dissipation factor minimizes dielectric loss in high-voltage systems, reducing the risk of partial discharge and thermal runaway at terminal connections.
The sheath maintains full flexibility and sealing performance even at -60°C, eliminating the cracking and brittleness common to heat-shrink sleeves in cold climate deployments. At high temperatures up to 220°C, it does not melt, deform, or release toxic fumes, making it suitable for installation near high-heat equipment such as transformers and power distribution cabinets. It also exhibits excellent resistance to ozone, acid rain, salt spray, and most common industrial chemicals, supporting deployment in coastal, industrial, and desert environments.
The high elastic resilience of LSR allows the sheath to be stretched over terminal assemblies without heating tools, reducing installation time by 60% compared to heat-shrink alternatives and eliminating fire risks associated with open-flame heating in enclosed spaces. The molded inner rib structure creates multiple independent sealing barriers, forming an IP68-rated waterproof seal even under continuous vibration, thermal expansion and contraction, or mechanical impact, preventing corrosion of terminal conductors caused by moisture and dust intrusion.
With a UL 94 V-0 flammability rating, the sheath self-extinguishes within 10 seconds of removing an ignition source, with no flaming drips. In fire scenarios, it emits very low levels of smoke and no toxic halogenated gases, reducing safety risks for personnel and equipment in enclosed power distribution rooms, subway tunnels, and residential wiring systems.
The High Insulation Weather-resistant LSR Cable Terminal Sheath is deployed across a wide range of power system scenarios, including:
To select the correct sheath size, measure three key dimensions of the terminal assembly:
The inner diameter of the selected sheath should be 10-15% smaller than the smallest measured diameter of the assembly to ensure sufficient sealing pressure, while the sheath length should be 5-10mm longer than the exposed terminal section to fully cover the connection interface and the adjacent 5mm of cable insulation. Standard sizes are available for cable cross-sections from 1.5mm² to 630mm², with custom molding available for non-standard terminal geometries.
All High Insulation Weather-resistant LSR Cable Terminal Sheaths are manufactured in an ISO 9001:2015 certified production facility, with a multi-stage quality control process covering incoming raw material testing, in-process dimensional inspection, and finished product performance validation:
We offer a 5-year limited warranty against material defects and manufacturing faults, with technical support available for installation guidance and custom sheath design for non-standard applications.
