Testing Water Vapor Transmission Rates for Flexible Barrier Materials IncludingMetalized Structures

摘要

As new materials with increased barrier properties are developed, the instruments and test methods used formeasuring the barrier properties must be modified. Metalized structures are a perfect example. Many challengesarise when measuring the water vapor transmission rate of metalized films, from erratic data to flaking of themetalization. Additionally, no ASTM method exists for determining the water vapor transmission rate of flexiblepouches. This paper reviews methods for analyzing the water vapor transmission rates of metalized structures, bothflat films and flexible packages.