... , alkali-free fiberglass as a reinforcing material Fiberglass Grating based on unsaturated polyester resin matrix , alkali-free ... gray , red , blue , black, natural color etc.Glass steel grating with lightweight, high strength , tough , solid , non-slip , ... , pharmaceutical and other industries , working platforms , stair treads , ditch cover , bridge walkway , filter plates , fillers such as a ...