Section 178.33b-5 - Material(a) The receptacles must be constructed of polyethylene terephthalate (PET), polyethylene napthalate (PEN), polyamide (Nylon) or a blend of PET, PEN, ethyl vinyl alcohol (EVOH) and/or Nylon.(b) Material with seams, cracks, laminations or other injurious defects are forbidden.74 FR 2268, Jan. 14, 2009