Pre-insulated Bushing Performance Characteristics
pre insulated sleeve, made of high-purity alkali-free glass fiber woven into a tube, and then coated with organic silicone on the outer wall of the tube and vulcanized. After vulcanization, it can be used for a long time in the temperature range of -65°C - 260°C and maintain its soft and elastic properties.
pre insulated junction sleeve Performance
The synthesis of special high-temperature resistant materials determines that insulated joint sleeve has many characteristics that are difficult to replace by other similar materials: high temperature resistance, thermal insulation, flame retardant, electrical insulation, chemical stability, weather aging resistance, cold resistance, water resistance, oil resistance, ozone resistance, voltage resistance, arc resistance, corona resistance, etc., especially safety and environmental protection performance, is the best alternative to asbestos and other hazardous products.
Characteristics and applications of silicone rubber fiberglass casing
1. Safe and environmentally friendly, protecting the health of workers
Alkali-free glass fiber itself has the characteristics of strong tensile strength, no wrinkles and breaks, resistant to vulcanization, smokeless, halogen-free, non-toxic, pure oxygen non-flammable, and good insulation. After being cured by organic silicone, its safety and environmental protection performance is further enhanced, effectively protecting the health of workers and reducing the incidence of occupational diseases. Unlike asbestos products, which are extremely harmful to the human body and the environment.
2. Excellent high temperature resistance
The silicone structure on the surface of silicone rubber fiberglass casing contains both "organic groups" and "inorganic structures". This special composition and molecular structure makes it combine the characteristics of organic matter with the functions of inorganic matter. Compared with other polymer materials, its most outstanding performance is high temperature resistance. With silicon-oxygen (Si-O) bond as the main chain structure, the bond energy of C-C bond is 82.6 kcal/g molecule, and the bond energy of Si-O bond is 121 kcal/g molecule in silicone, so it has high thermal stability, and the chemical bonds of molecules do not break or decompose under high temperature (or radiation irradiation). Silicone is not only resistant to high temperature, but also to low temperature, and can be used in a wide temperature range. Both chemical properties and physical and mechanical properties change very little with temperature.
3. Anti-splash, multiple protection
In the smelting industry, the medium temperature in the electric furnace is extremely high, which is easy to form high-temperature splashing (the same is true in the welding industry). After cooling and solidification, slag is formed on the pipe or cable, which will harden the rubber of the outer layer of the pipe or cable and eventually brittle and crack. Then damage unprotected equipment and cables. After multiple layers of silicone coated fiberglass sleeves, multiple safety protections can be achieved. The highest temperature resistance can reach 1300 degrees Celsius. It can effectively block the splashing of high-temperature molten materials such as molten iron, molten copper, and molten aluminum, and prevent surrounding cables and equipment from being damaged.
4. Thermal insulation, energy saving and consumption reduction, radiation resistance
In high-temperature workshops, many pipes, valves or equipment have very high internal temperatures. If they are not covered with protective materials, it is easy to cause burns or heat loss. Better silicone rubber fiberglass sleeves have better thermal stability and radiation resistance and thermal insulation than other polymer materials. They prevent accidents, reduce energy consumption, and prevent the heat of the medium in the pipeline from being directly transferred to the surrounding environment, which makes the temperature of the workshop too high, saving cooling costs.
5. Moisture-proof, oil-proof, weather-proof, pollution-proof, and extend the service life of equipment
Silicone rubber fiberglass sleeves have strong chemical stability. Organic silicon does not react to oil, water, acid, alkali and other substances. It can be used for a long time without aging within 260°C. The service life in the natural environment can reach several decades, which can maximize the protection of pipes, cables and equipment in these occasions and greatly extend their service life.
6. Ozone resistance, voltage resistance, arc resistance, and corona resistance
Because the surface is coated with organic silicone, its main chain is -Si-O-, and there is no double bond, it is not easily decomposed by ultraviolet light and ozone. High-temperature sleeves have good electrical insulation properties. Their dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistivity and surface resistivity are among the best in insulating materials, and their electrical properties are little affected by temperature and frequency. Therefore, they are a stable electrical insulating material and are widely used in the electronics and electrical industries.
7. Flame retardant, reducing the incidence and spread of fire
If the pipeline is transporting flammable or toxic media, it is easy to cause fire or casualties when leakage occurs; cables often burn due to local high temperatures; silicone rubber fiberglass sleeves are woven with extremely high-temperature resistant glass fibers, and the surface silicone is added with appropriate flame retardants and other special materials, making it extremely flame retardant. Even if a fire occurs, it can prevent the spread of the fire and protect the internal pipeline intact for a long time, providing sufficient time for the rescue of important information such as data and information.
