1.mine grid,high tensile strength 600-400kN/m 2.simple and convenient construction 3.fire resistant,antistatic 4.polyester mine grid 400-400kN/m for long-wall recovery system roof support,hock ... self-ignition risks. Shandong Hock Mining Engineering Co.,Ltd Mine Grid,Mining Grid,Mining Geogrid,Polyester Geogrid,Biaxial Geogrid. mine grid 400-400kN/m for longwall recovery system,rib and roof support