TAPPI T 448 om-09

Description

1. Scope

1.1 This method provides for the gravimetric determination of the water vapor transmission rate (WVTR) ofsheet materials at 23°C with an atmosphere of 50% RH on one side and a desiccant on the other.

1.2 It is generally suitable for materials up to 3 mm thick (1/8 inch), although it may be used with caution forthicker materials if the edges of the specimen are completely sealed.

1.3 For testing at other conditions, see TAPPI T 464 “Gravimetric Determination of Water VaporTransmission Rate of Sheet Materials at High Temperature and Humidity” for 37.8°C (100°F) and 90% RH.

1.4 This test can be used for both creased and uncreased specimens. See TAPPI T 465 “Static Creasing ofPaper for WVT Tests” and TAPPI UM 590 “Creasing of Paperboard for Water Vapor Transmission Rate (WVTR)Testing” for the creasing procedure for paper and paperboard respectively.

Product Details

Published:

01/01/2009

Number of Pages:

4

File Size:

1 file , 120 KB

Note:

This product is unavailable in Ukraine, Russia, Belarus