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Measuring thickness for Optimizing Oxygen Barrier Performance in Packaging


PET layer plays an important role in oxygen barrier performance for the tested materials. To investigates the influence of film thickness on oxygen permeability in packaging materials, we tested three composite film specimens with different PET (polyethylene terephthalate) and PE (polyethylene) layer thicknesses.

The test adopted a differential pressure method according to ASTM D1434, test instrument was Labthink VAC-V2 Gas Permeability Tester. We prepared specimens in different thickness, PET(12μm)/PE(45μm), PET(12μm)/PE(60μm) and PET(25μm)/PE(45μm). The instrument measures the Oxygen Transmission Rate (OTR), which signifies the amount of oxygen permeating through a film per unit area under specific conditions.



The test result shows that OTR decreased with increasing thickness for both PET and PE layers. Thicker PET layer (Specimen #3) resulted in a more significant OTR reduction compared to a thicker PE layer (Specimen #2).

PET layer plays a dominant role in oxygen barrier performance for the tested materials. Increasing PET thickness offers a more efficient way to improve oxygen permeability compared to increasing PE thickness.

As the demand for functional packaging materials grows, testing methods are evolving to ensure a more comprehensive evaluation of packaging films. Labthink encourages collaboration with packaging industry companies for quality control! Visit the website www.labthink.com to learn more!
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