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Geogrid is made of high molecular polymer through extrusion, stretching and other processes, and has a regular grid structure. Its raw materials usually include polypropylene (PP), polyethylene (PE), polyester (PET), etc. According to the manufacturing process and grid shape, it can be divided into unidirectional geogrid and bidirectional geogrid. The tensile strength of unidirectional geogrid is higher in one direction, while bidirectional geogrid has good tensile strength in both vertical and horizontal directions.