Defying High Temperatures | SUNKEAN Silicone Rubber Cables Certified by UL758

With the rapid global expansion of renewable energy, electrical equipment is facing increasingly demanding conditions. Energy systems are evolving toward higher power density, greater safety, and longer durability. While traditional PVC or XLPE insulated cables perform adequately in ordinary environments, they may fail under extreme conditions or high-temperature operations. In high-temperature applications, frequent thermal cycles, or confined spaces inside equipment, these common insulation materials can become stiff, crack, or lose their electrical insulation properties.

In the global wire and cable certification system, UL (Underwriters Laboratories) is one of the most authoritative bodies. UL standards are widely recognized as benchmarks for safety, reliability, and compliance. First published in 2014 and updated in 2024 to reflect industry advancements, the UL758 standard specifically applies to Appliance Wiring Material (AWM). Unlike building wiring or external power supply cables, AWM is primarily used for internal wiring in appliances, equipment, control cabinets, and electronic devices. Achieving UL758 certification means the cable can maintain safety and stability under multiple stressors such as high and low temperatures, voltage surges, chemical exposure, and mechanical strain. For companies exporting to North America and other international markets, UL certification serves as a passport to global market access. Key aspects of UL758 include:

These tests include: high and low temperature resistance tests to verify the material's stability and operational capability under extreme temperature environments; voltage breakdown tests to assess the dielectric strength and insulation reliability under high voltage loads; flame retardancy tests (typically using the VW-1 vertical flame test) to measure the material's ability to resist flame propagation; cold bend tests to ensure the cable remains flexible and does not become brittle at low temperatures; tensile strength and elongation at break tests to examine the material's tensile resistance and elastic deformation under mechanical stress; and chemical and oil resistance tests to verify structural integrity when exposed to oils, solvents, acids, alkalis, and other chemical substances. Additionally, the standard may include supplementary tests such as abrasion resistance, ozone resistance, damp heat aging, and crush resistance, thereby providing a comprehensive assessment of the cable's adaptability and long-term reliability in harsh application environments.

In renewable energy applications, particularly battery energy storage systems (BESS), cables must simultaneously withstand high temperatures and humidity inside battery compartments, low temperatures and UV exposure outdoors, as well as thermal stress and high current surges from frequent charge-discharge cycles. These conditions place extreme demands on a cable's weather resistance, heat tolerance, and electrical safety. UL758-certified cables are designed precisely for such challenges. Their testing covers high and low temperature resistance, cold bend performance, voltage breakdown resistance, VW-1 flame retardancy, chemical and oil resistance, and mechanical strength—ensuring reliable performance even in complex environments. SUNKEAN's products have passed these rigorous verifications, complying not only with international safety standards but also demonstrating outstanding performance and durability across diverse energy applications.

Silicone rubber is a polymer material with a backbone primarily composed of silicon-oxygen (Si–O) bonds. These bonds have significantly higher energy than those in common organic polymers like PVC, giving silicone rubber superior heat resistance and resistance to chemical degradation. It maintains elasticity and insulation properties across an extremely broad temperature range from -60°C to +200°C. 

Broad Temperature Range Adaptability: UL3132 and UL3135 use high-performance silicone rubber materials, enabling stable operation in extreme temperatures from -60°C to +200°C. They are suitable for frigid regions or high-temperature industrial environments. Their excellent heat and cold resistance ensures long-term operation without becoming brittle or aging, whether inside battery compartments, in outdoor photovoltaic equipment, cold region engineering, or high-heat zones, guaranteeing continuous and reliable power supply.