Polyimide Film is a good HN grade insulating material. It is widely used for insulation purposes in electrical appliances, which are used in a special environment. To use the polyimide film means reducing the volume and weight of the electrical appliances while retaining the same output or increase the capacity without increasing in frame size. It can also prolong the service life of electrical appliances and increase their reliability. Its long-term working temperature is under 200 °C.