Fiberglass Reinforced Plastic (FRP) sand lined pipes are manufactured using a mechanical winding process. They are composed of a resin matrix with glass fibers wound layer by layer around a rotating mandrel according to the process requirements. Quartz sand is evenly laid between the fibers as the sand lining. This type of pipe combines the advantages of FRP pipes with the properties of sand, making it widely applicable in construction, chemical industry, wastewater treatment, power, and oil fields.

Fiberglass-reinforced sand-lining pipes offer numerous advantages, including high strength, corrosion resistance, flame retardancy, and excellent heat and frost resistance. Specifically, they have strong resistance to external loads, can be directly buried beneath roadways, are cost-effective in construction, and provide significant social and economic benefits. These pipes, designed for specialized use, can withstand erosion from various chemical fluids. Additionally, they feature lightweight strength, smooth inner walls, good insulation properties, and high wear resistance, making installation, handling, and maintenance more convenient.