How can temperature-resistant soft fluororubber heat shrink tubing simultaneously meet the multiple requirements of flame retardancy, electrolyte resistance, and high insulation?
Publish Time: 2025-11-25
In new energy vehicles, energy storage systems, and high-end industrial equipment, cables and electrical connectors are often exposed to harsh environments such as high temperatures, high voltages, and highly corrosive electrolytes. Traditional insulation materials often struggle to achieve all these performance characteristics simultaneously. However, temperature-resistant soft fluororubber heat shrink tubing, manufactured using a radiation crosslinking process, successfully achieves a harmonious balance of flame retardancy, electrolyte resistance, and high insulation thanks to its unique molecular structure and advanced manufacturing technology, becoming a reliable barrier for electrical safety protection under extreme conditions.1. Radiation Crosslinking Constructs a Three-Dimensional Network, Laying the Foundation for Comprehensive PerformanceThe core of temperature-resistant soft fluororubber heat shrink tubing lies in its crosslinking structure achieved through high-energy electron beam radiation. This process, without the addition of peroxides or vulcanizing agents, forms a dense and stable three-dimensional network structure between the polymer backbone. This structure not only significantly improves the material's thermal stability but also greatly enhances its resistance to swelling and chemical corrosion. More importantly, the cross-linked network effectively suppresses the material's dripping behavior at high temperatures—a key mechanism for achieving self-extinguishing flame retardancy. When exposed to an open flame, the material surface rapidly carbonizes to form a heat-insulating layer, isolating oxygen and preventing the flame from spreading.2. Molecular inertness resists electrolyte corrosion, ensuring long-term sealing protectionOrganic carbonate electrolytes widely used in new energy battery systems have extremely strong permeability and swelling properties, easily disrupting the molecular chains of ordinary rubber or plastics. However, soft fluororubber, due to its rich carbon-fluorine bonds in its main chain, is chemically extremely inert and reacts almost entirely with no organic solvents, acids, alkalis, or oxidants. Even after long-term immersion in electrolytes above 60°C, its volume change rate can still be controlled within 5%, with no significant degradation in mechanical properties. This superior resistance ensures that when heat shrink tubing covers high-voltage connection terminals of battery modules or BMS wiring harnesses, even in the event of minor leaks, it can continuously provide a complete seal and physical isolation, preventing short circuits or corrosion failure.3. High-purity formulation and dense structure work synergistically to achieve excellent electrical insulationHigh insulation performance depends not only on the intrinsic resistivity of the material but also on preventing the migration of impurity ions and surface leakage. Temperature-resistant soft fluororubber heat-shrink tubing uses high-purity monomers during the raw material selection stage and completes mixing and extrusion in a clean environment, minimizing the residue of metal ions and polar impurities.4. Integrated protection: A leap from single performance to system safetyThe value of temperature-resistant soft fluororubber heat-shrink tubing lies not only in its outstanding individual performance indicators but also in its integration of flame retardancy, chemical resistance, and insulation into a single thin-walled structure. During installation, heat shrinking is all that's needed to tightly fit irregularly shaped joints, forming a seamless sealing layer without the need for additional adhesives or sleeve stacking. This integrated protection solution greatly simplifies the wiring harness assembly process while avoiding the risk of aging and delamination between multi-layer material interfaces. Under complex stresses such as battery pack vibration and thermal cycling, its elastic recovery capability can continuously maintain the integrity of the seal, truly achieving "one-time coverage, lifetime protection."Temperature-resistant soft fluororubber heat-shrink tubing, through the deep integration of radiation crosslinking technology, highly chemically inert molecular structure, and high-purity manufacturing processes, constructs multiple protective barriers at the molecular level. It is not only a culmination of material properties but also an indispensable "invisible armor" for electrical safety in the new energy era, safeguarding the reliable operation of high-energy-density, high-voltage systems.
