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GRP pipe is also called glass fiber wound sand pipe (RPM pipe). It mainly uses glass fiber and its products as reinforcing materials, unsaturated polyester resins and epoxy resins with polymer components as basic materials, and inorganic non-metallic particulate materials such as quartz sand and calcium carbonate as fillers as main raw materials. The standard effective length of the tube is 6m and 12m, and its production methods include fixed-length winding process, centrifugal casting process and continuous winding process. It can be classified according to the product's process method, pressure grade PN and stiffness grade SN. Reinforced plastic with glass fiber or its products as reinforcing material. It is called glass fiber reinforced plastic, or glass fiber reinforced plastic. Due to the different types of resins used, it is known as polyester fiberglass, epoxy fiberglass and phenolic fiberglass. Glass is hard and brittle, with good transparency, high temperature resistance, corrosion resistance and other properties; at the same time, steel is hard and not brittle, and also has the characteristics of high temperature resistance. So people began to think that if a material could be made that not only has the hardness, high temperature resistance, and corrosion resistance of glass, but also has the characteristics of being as hard and unbreakable as steel, then this material will be very useful. After research and experiments, people finally produced such a composite material. It is a glass steel pipe that can stand shoulder to shoulder with steel. GRP pipes are widely used in petroleum, electric power, oil, electricity, electric It has been widely used in chemical industry, papermaking, urban water supply and drainage, factory sewage treatment, seawater desalination, gas transmission and other industries.