... reinforce unsaturated polyester, vinyl ester, phenolic, polyurethane and epoxy resins. fiber glass roving( C glass) are mainly used to produce pipes, pressure vessels, gratings ... resin: polyester viny lester & expoxy resins.Moisture:≤0.1% Loss on ignition: 0.55%±0.2%Filament diameter: 17-24μm fiber glass ...