... 2.sidewalks,stairs,trench covers in chemical works 3.oil field,sewage treatment. Fiberglass molded grating, FRP grating,Fiberglass grating,fiberglass grille,FRP grille ... : fiberglass roving, resin, and some other filling things;2.Usage: oil industry, power engineering, sewage treatment, work way, operating plateform, trench cover ...