Kapton is a kind of polyimide film with all aromatic ring structure. It has excellent physical, chemical and electrical properties that can be maintained over a wide range of temperatures. It can be used at the temperature of - 269 ℃ + 400 ℃ in a short period of time. It is difficult to burn and melt. It can maintain a high degree of discharge at high temperature and can resist high energy radiation. Using this material for insulation can guarantee a long service life and can be used for 8 years at 250 ℃ before embrittlement.
Because of Kapton's tenacity, high wear resistance and cutting resistance, the insulation wrapped with this kind of film tape is more uniform than that of enameled wire, and it is not easy to be damaged at the edges and corners of the rectangular cross-section conductor. Especially, it can maintain its high discharge strength at high temperature. Compared with the conventional insulation, the thickness can be reduced by 50%, and the copper section in the groove can be increased, and the operating temperature can be increased. The thin Kapton insulation also helps to improve the current capacity because it is easy to conduct heat. At the same time, with the decrease of insulation thickness, the size and weight are reduced. If Kapton is used as insulation in traction motor, the power can be increased by 20% without increasing motor size, while the cost is only increased by 4%.http://www.china-polyimide.com