กระดาษและผลิตภัณฑ์กระดาษ
เอกสารมาตรฐาน
สหรัฐอเมริกา
TAPPI
T 464 om-22
Water vapor transmission rate of paper and paperboard at high temperature and humidity
2022
5
offline
This method is for the gravimetric determination of the water vapor transmission rate (WVTR) of
sheet materials at 37.8°C (100°F) with an atmosphere of 90% RH on one side and a desiccant on the other. It is generally suitable for any material up to 3 mm (1/8 in.) thick, although it may be used with caution
for thicker materials if the edges of the specimen are completely sealed. ....