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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.