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Auto roll stock packing/ Snack Packaging Bags with custom logo Material Thickness (micron) OVTR CC/M^2 24hrs at 23℃ 0%RH WVTR G/M^2 24hrs at 38℃ 90%RH opp 20 1900 6 opp 30 1800 5.8 opp 40 1700 5.5 PET ...