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PVC roof sheet is made of PVC as the main raw material, supplemented by a variety of other chemical raw materials, after high-temperature plasticization and extrusion of various thicknesses, it is cooled and shaped. Because the raw material of PVC chemical industry itself has the function of resisting alkali corrosion of chemical hydrochloric acid, a variety of chemical materials are used to assist the secret ratio of raw materials to achieve the purpose of resisting ultraviolet radiation and resisting ageing, and the life expectancy can be used for many years.