... 5.Used in soft rock The FRP rock bolt is made of fiberglass as reinforced material and polyester resin by pultrusion process.Product ... electromagnetic wave, good for concealing of the workApplication Field:Hard rock mining, Ground stabilization,Salt mines, Tunneling, Tiebacks, Temporary ground support ... ≥500140≥80242400150×150×10≥500160≥88.2 high strength FRP rock bolt