Is by the middle of a layer of polyester film and the two sides of the paper, the heat level of F (155 ℃) of soft composite materials. With good mechanical properties, such as tensile strength and edge tear resistance and good electrical strength. Its surface is smooth, when the production of low voltage motor using automatic logoff machine to ensure trouble-free. Mainly used in the trough of low pressure motor, tank insulation cover and alternate with, also can be used as a transformer or other appliances for layer insulation.