▁an ▁inf usion ▁process . ▁Other ▁manufact ur ers ▁use ▁variations ▁on ▁this ▁technique , ▁some ▁including ▁carbon ▁and ▁wood ▁with ▁fib reg lass ▁in ▁an ▁epo xy ▁matrix . ▁Other ▁options ▁include ▁pre - im pre gn ated ▁(" pre pre g ") ▁fib reg lass ▁and ▁vac u um - ass isted ▁res in ▁transfer ▁m ould ing . ▁Each ▁of ▁these ▁options ▁use ▁a ▁glass - f ib re ▁rein for ced ▁polym er ▁composite ▁constructed ▁with ▁differ ing ▁complexity . ▁Perhaps ▁the ▁largest ▁issue ▁with ▁more ▁simpl istic , ▁open - m ould , ▁wet ▁systems ▁are ▁the ▁em issions ▁associated ▁with ▁the ▁vol atile ▁organ ics ▁released . ▁Pre im pre gn ated ▁materials ▁and ▁res in ▁inf usion ▁techniques ▁avoid ▁the ▁release ▁of ▁vol at iles ▁by ▁containing ▁all ▁V OC s . ▁However , ▁these ▁contained ▁processes ▁have ▁their ▁challeng es , ▁namely , ▁the ▁production ▁of ▁thick ▁l amin ates ▁necessary ▁for ▁struct ural ▁components ▁becomes ▁more ▁difficult . ▁As ▁the ▁pre form ▁res in ▁per me ability ▁dict ates ▁the ▁maximum ▁l amin ate ▁thick ness , ▁ble eding ▁is ▁required ▁to ▁eliminate ▁void s ▁and ▁ensure ▁proper ▁res in ▁distribution . ▁One ▁solution ▁to ▁res in ▁distribution ▁a ▁partially ▁im pre gn ated ▁fib reg lass . ▁During ▁ev acu ation , ▁the ▁dry ▁fabric ▁provides ▁a ▁path ▁for ▁air flow ▁and , ▁once ▁heat ▁and ▁pressure ▁are ▁applied , ▁the ▁res in ▁may ▁flow ▁into ▁the ▁dry ▁region ▁resulting ▁in ▁a ▁thoroughly