fiberglass frp/grp heavy duty grating, mesh 1.5X1.5", ... , ABS certi, ASTM-E84 fire resist Fiberglass grating, FRP / GRP molded and Pultruded grating professional factory:About Our Products:Resin: ... open rate of 33%, 40%, 50%, 60%.Other products: FRP pultruded grating, profiles, handrail system, stair tread, stair nosing, ... your own design and technical request. Fiberglass / FRP / GRP heavy duty grating