... , alkali-free fiberglass as a reinforcing material Fiberglass Grating based on unsaturated polyester resin matrix , alkali-free ... treatment , chemical , plating equipment such as trench cover , overflow tank . Can be customized according to user demand !Color : ... gray , red , blue , black, natural color etc.Glass steel grating with lightweight, high strength , tough , solid , non-slip , corrosion ...