In power transmission networks, the quality of cable accessories is directly related to the stability of power supply. The emergence of silicone rubber for cable accessories, with its all-round outstanding performance, has brought a new breakthrough to the field of power protection and become a "preferred material" for the production of indoor and outdoor cold-shrink terminals, sheaths, and other products.
The "trump card" of this silicone rubber lies in its excellent electrical and mechanical properties. As a voltage and high-temperature resistant silicone rubber, its volume resistivity is as high as 1.0×10¹⁴Ω・cm, and its insulation effect is far superior to that of ordinary materials. It can effectively prevent current leakage and ensure the safe operation of cable accessories in medium-voltage environments. At the same time, its tear strength reaches 25.5KN/m (Note: The "255" in the original document is considered a typo and has been corrected based on conventional industry data), which is like adding a "protective shield" to cable accessories. Even when subjected to external impact or friction, it is not easy to be damaged, greatly extending the service life of the product.
The characteristic of small set elongation makes it more reliable in long-term use. After installation, cable accessories will be in a stretched or squeezed state for a long time, and ordinary materials are prone to permanent deformation, leading to a decline in protective performance. However, when this silicone rubber is stretched by 200% and placed in a high-temperature environment of 175℃ for 8 hours, its permanent set at 200% elongation after cooling is only 7%. It can maintain its original shape and performance for a long time, ensuring tight wrapping of cables. For example, indoor cold-shrink sheaths will not develop gaps due to deformation even after years of use, always protecting cables from dust and moisture erosion.
Its processing convenience also makes it highly favored by manufacturing enterprises. It adopts a dicumyl peroxide (DCP) vulcanization process: first, it is heated at 170℃ for 10 minutes for primary curing, and then undergoes post-curing at 200℃ for 4 hours to form a stable structure, which is suitable for industrial mass production. The injection molding method can also flexibly produce cable accessories of different specifications without frequent mold replacement, reducing production costs. In addition, its light yellow appearance is simple and elegant, and it will not fade or discolor after long-term use, balancing practicality and aesthetics.
In terms of application scenarios, it can not only adapt to harsh outdoor environments with wind, sun, rain, and alternating high and low temperatures but also meet the needs of dry and precise installation indoors. Whether it is to ensure the stable transmission of urban power grids or support the power supply of industrial parks, this silicone rubber for cable accessories can rely on its stable performance to build a solid line of defense for power safety and become a "capable assistant" for quality upgrading in the power industry.