▁im pre gn ated ▁l amin ate ▁structure . ▁ ▁E po xy - based ▁compos ites ▁have ▁environmental , ▁production , ▁and ▁cost ▁advantages ▁over ▁other ▁res in ▁systems . ▁E po x ies ▁also ▁allow ▁shorter ▁c ure ▁cycles , ▁increased ▁dur ability , ▁and ▁improved ▁surface ▁finish . ▁Pre pre g ▁operations ▁further ▁reduce ▁processing ▁time ▁over ▁wet ▁lay - up ▁systems . ▁As ▁tur bine ▁bl ades ▁pass ▁ 6 0 ▁metres , ▁inf usion ▁techniques ▁become ▁more ▁pre val ent ; ▁the ▁traditional ▁res in ▁transfer ▁m ould ing ▁injection ▁time ▁is ▁too ▁long ▁as ▁compared ▁to ▁the ▁res in ▁set - up ▁time , ▁limit ing ▁l amin ate ▁thick ness . ▁In jection ▁forces ▁res in ▁through ▁a ▁th icker ▁p ly ▁stack , ▁thus ▁depos iting ▁the ▁res in ▁where in ▁the ▁l amin ate ▁structure ▁before ▁gel ation ▁occurs . ▁Special ized ▁epo xy ▁res ins ▁have ▁been ▁developed ▁to ▁custom ize ▁lif et imes ▁and ▁vis cos ity . ▁ ▁Car bon ▁fib re - re in for ced ▁load - b ear ing ▁sp ars ▁can ▁reduce ▁weight ▁and ▁increase ▁st iff ness . ▁Using ▁carbon ▁fib res ▁in ▁ 6 0 - met re ▁tur bine ▁bl ades ▁is ▁estimated ▁to ▁reduce ▁total ▁bla de ▁mass ▁by ▁ 3 8 % ▁and ▁decrease ▁cost ▁by ▁ 1 4 % ▁compared ▁to ▁ 1 0 0 % ▁fib reg lass . ▁Car bon ▁fib res ▁have ▁the ▁added ▁benefit ▁of ▁reducing ▁the