... construct, which would enhance the safety of mining area.Technical Specification of HockGrid® Mine Grid (Polyester Geogrid) Tensile strength ( warp/weft ... ,120/120,200/200,300/300,400/400,600/400,800/800,1000/1000kN/m. Mesh size: 20mm x 20mm,30mm x ... ,Polyester Geogrid Manufacturers. Polyester Mine Grid for Roof of the Camera