... materials, etc. Geogrid divided into plastic geogrid, geogrids, glass geogrid and glass-polyester geogrid main categories.(1) Plastic geogridPlastic earthwork grid ... to its manufacture different stretching direction can be unidirectional and bi-stretch. It is in the extruded ... ) punch, and heating purposes of directional stretch. Unidirectional grid only stretch along plate length direction, which ...