To provide a method for evaluating vapor barrier properties quantitatively for precisely executing the vapor barrier property evaluation of an ultra-high barrier property film sheet and the evaluation of defective points that have not been made conventionally, and to provide a cell for evaluation used for the method for evaluating vapor barrier properties.
In the cell for evaluating vapor barrier properties, a metal layer that is corroded by reaction with moisture is formed on one side of the film sheet for evaluating the vapor barrier properties by a vacuum process, and the surface is sealed by the vapor impermeable metal layer. The upper layer of the vapor water permeable metal layer may be sealed by an organic matter, where the mass change is 1 mg/24 hours or less in an exposure area of 50 cm2 when being exposed to a temperature of 40±0.5°C and a relative humidity of 90±2%.
SUGIZAKI ATSUSHI
KUBO HIDEKI
ITO HISASHI
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