This product is mainly used in the production process. In the processes of tread, tread top, tire wall and tread bracing layer for radial tire, the prefabricated rubber sheet is required to prevent from distortion and stretching; while this soft, stiff and neat isolating fresh-keeping film is the ideal material to keep the rubber sheet fresh, for it can be fully applied to the prefabricated rubber sheet, yet easy to peel. With all performance indexes, such as textile strength, elongation at break, tearing strength, melting-point, content of copper, that of manganese, acetone abstract, having met the application requirements, this product are popular among and accepted by world major tire manufacturers.