This product is mainly used in the production process of radial tyre and the essential auxiliary material for the production of radial tyre. In the processes of tread, tread top, tyre wall and tread bracing layer for radial tyre, the prefabricated rubber sheet is required; 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 tyre manufacturers