Teach you how to choose heat-resistant high temperature wires and cables
General wires and cables use plastic and rubber as insulation sheaths. These materials are conventional engineering materials, have rich sources, can meet large-scale production, and have relatively low cost. But for some special industries, such as petrochemical, steel, aerospace, shipbuilding, military industry, pharmaceuticals, food, plastic machinery, boilers and other industries related to heat and high temperature, wires and cables that can withstand a certain high temperature are required, ordinary wires The cable obviously cannot be used. Wires and cables that can withstand high temperatures are required to ensure the safe operation of power and signals.
With the rapid development of China's economy, the demand for high-temperature cables in special industries has grown rapidly. Heat-resistant and high-temperature cables are growing at a rate of 20% per year. High-temperature cables, as an important part of special cables, have strong vitality. In short supply, China imports about two billion yuan from abroad every year for domestic construction. The general requirements of the International Electrotechnical Commission (IEC) for the heat resistance rating of insulation are divided into:
Heat-resistant grade YAEBFHC
Maximum allowable operating temperature / ℃ 90105120130155180≥180
Our common wire and cable insulation and sheath are ordinary engineering rubber and plastic as the basic resin, but the requirements are insulation grade. Common rubber materials for cables are: butyl rubber, ethylene-propylene rubber, natural rubber, and chlorosulfonated polyethylene, etc., and the operating temperature is (60 to 75) ° C; common plastic materials for cables are polyvinyl chloride, polyethylene (including Polyethylene) and polypropylene, etc., the working temperature is (70 ~ 90) ° C. It can be seen that these cables are not heat-resistant or high-temperature cables in the strict sense.
Heat-resistant cables generally refer to cables at (90-155) ° C and below, while high-temperature cables are cables at 180 ° C and above. To solve the problem that ordinary cables are not resistant to high temperatures, it is necessary to improve the materials or use insulation-grade materials that can withstand high temperatures.