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humidity atmosphere by placing in the bottom of the test cup a saturated salt solution or deionized water (wet side) to create a partial water vapor pressure difference, ΔP, across the specimen. The cup is weighted for different exposure times, Δt, to determine the mass increase of the desic- cant Δm. WVTR is the standard measurement by which films are compared for their WVP = m · eA · t · P 378       10 Swelling and barrier properties ability to resist moisture transmission. Lower values indicate better moisture protec- tion. Only values reported at the same

containing a desiccant. The tests are then performed in a controlled temperature and humidity atmosphere by placing in the bottom of the test cup a saturated salt solution or deionized water (wet side) to create a partial water vapor pressure difference, ΔP, across the specimen. The cup is weighted for different exposure times, Δt, to determine the mass increase of the desic- cant Δm. WVTR is the standard measurement by which films are compared for their ability to resist moisture transmission. Lower values indicate better moisture protec- tion. Only values reported