... quality and competitive price.FRP manhole covers are made from fiber glass, resin, quartz and corundum etc. Compared with other composite ... GRP manhole cover) are made from composite materials such as glass fiber, resin, quartz, corundum etc..2) Applying wear-resistant ... resin (UP) (ISO type resin, vinyl ester resin)-Glass fiber (E-glass 2400 Tex)-Quartz-Corundum-Antioxidant-Firming agent-Promoter-UV ...