PEN (PolyEthylene Naphthalate), nylon and EVOH have a much higher barrier to oxygen than PET. They could be sandwiched between two PET layers.

• PEN(PolyEthylene Naphthalate)，尼龙及EVOH对氧气的阻融性较PET强，可用夹层的方法将它夹在外层及内层PET料之间。