WATER VAPOR TRANSMISSION RATE OF PAPER AND PAPERBOARD AT HIGH TEMPERATURE AND HUMIDITY
Water vapor transmission rate, Gravimetry, High temperature
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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.
For testing at other conditions see TAPPI T 448 “Water Vapor Transmission Rate of Paper and Paperboard at 23°C (73°F) and at 50% RH.”
This test can be used for both creased and uncreased specimens. See TAPPI T 465 “Static Creasing of Paper for WVT Tests” or TAPPI UM 590 “Creasing of Paperboard for Water Vapor Transmission Rate (WVTR) Testing.
It Provides information on:
- Sampling and test specimens
- Conditioning
- Procedure
- Calculation
- Keywords
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