fiberglass frp/grp heavy duty grating, mesh 1.5X1.5", rib:12/9mm, ... grating professional factory:About Our Products:Resin:Ortho Polyester (GP), Iso polyester (ISO) , Vinyl ester (VE) , PhenolicThickness:any between ... : ASTM E84 Flame speed Index = 15 for GP, Iso, resin, = 10 for VE, = 0 for phenolic, Smoke development index ... design and technical request. Fiberglass / FRP / GRP heavy duty grating