Insulating sleeves play an indispensable role in the field of high-speed rail, serving as key fundamental components that ensure the safe and reliable operation of the train's electrical system. They are widely used in the on-board traction system, brake control unit, door control system, and cabin information network of high-speed trains for insulation protection and mechanical protection of wiring harnesses. They must withstand long-term exposure to continuous vibration, temperature changes, as well as complex environmental tests such as dust, moisture, and other challenges during operation. Especially in high-voltage electrical equipment and signal transmission systems, insulating sleeves effectively prevent line wear, short circuits, and signal interference due to their excellent aging resistance, low temperature resistance, and flame retardant properties. Zhengtong Insulation provides insulation material solutions that are resistant to high and low temperatures, flame retardant, and anti-aging, fully ensuring the operational stability and long-term durability of high-speed rail vehicles under harsh working conditions.