In the operation of deep-well water pumps, cables serve as the "blood vessels" conveying vital energy; constantly immersed in high-pressure aquatic environments, they face the dual threats of "water pressure breakdown" and "water tree aging." Under the infiltration of water molecules, ordinary insulation materials experience a drastic decline in insulating performance and are highly susceptible to forming tree-like conductive channels under the influence of electric fields—ultimately leading to insulation failure. Phenyl raw rubber, leveraging its exceptional hydrophobicity and molecular density, transforms into a "deep-sea insulation shield" for cables, constructing an indestructible waterproof barrier at the microscopic level.

The core of phenyl raw rubber's resistance to water pressure breakdown lies in its "molecular-level hydrophobicity" and "high cross-linking density." The introduction of phenyl groups into the siloxane backbone not only elevates the material's glass transition temperature but, more critically, enhances the polarity and density of the molecular chains. This highly dense structure effectively fills the microscopic voids between the insulation layer and the conductor, creating a "seamless" hydrophobic barrier that significantly boosts volume resistivity and fundamentally severs the pathways for water molecule infiltration. Concurrently, phenyl raw rubber's excellent "coefficient of thermal expansion matching" ensures that, across a wide temperature range of -40°C to 200°C, it maintains thermal deformation synchronicity with the conductor, insulation layer, and sheath materials. During severe outdoor thermal cycling, it prevents the insulation layer from cracking or delaminating due to thermal stress, thereby averting corona discharge and localized electric field distortions that might otherwise arise from interfacial gaps.

Furthermore, phenyl raw rubber's resistance to UV radiation and humid heat enables it to withstand long-term outdoor aging, preventing the contamination of insulation surfaces by conductive byproducts resulting from material degradation. From dense insulation at the molecular level to macroscopic thermal stress buffering, phenyl raw rubber—with its exceptional performance characterized by "high-temperature, high-resistance, and thermally stable insulation"—effectively resolves the critical issue of reverse leakage current in photovoltaic diodes operating under high-temperature conditions. It is not only a key material for enhancing component reliability and power generation efficiency, but also the invisible guardian ensuring the long-term, 25-year operation of photovoltaic systems.