... Owenscorning, 3mm~50mm, FRP plastic; concrete, manhole, gypsum board alkali resistant fiberglass chopped strandsFiber length: 3mm 4.5mm 6m 12mm 18mmFiber: E ... -glassUsage:FRP fiberglass reinforcded plastic, PP PA BMC2. reinforce concrete, cement, manhole, ... boardQuality is B grade, raw material is from Owenscorning alkali resistant fiberglass chopped strands