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เอกสารมาตรฐาน
สหรัฐอเมริกา
TAPPI
T 448 om-21
Water vapor transmission rate of paper and paperboard at 23C and 50% RH
2021
5
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This method provides for the gravimetric determination of the water vapor transmission rate (WVTR)
of sheet materials at 23C with an atmosphere of 50% RH on one side and a desiccant on the other. It is generally suitable for materials up to 3 mm thick (1/8 inch), although it may be used with caution
for thicker materials if the edges of the specimen are completely sealed. ....