... 3.fire resistant,antistatic 4.polyester mine grid 400-400kN/m for long-wall recovery system roof support,hock mining ... protection of the blast areaSlice mining longwall facesDeclining longwall faces for roof supportMine Grid Characteristics:Large square, flexible and light, ... Grid,Mining Geogrid,Polyester Geogrid,Biaxial Geogrid. mine grid 400-400kN/m for longwall recovery system,rib and roof support