| 摘要 |
Multiple ply packaging materials formed of certain polymer films, each having a gas permeability of 10 or less cc per 100 square inches per mil thickness over a 24 hour period at one atmosphere pressure, and 73 DEG F. and 50% R.H., such as polyvinylidene chloride, exhibit unexpectedly high gas barrier properties in comparison with a single film of the same equivalent thickness.
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