PERMATRAN-W® Model 3/33 Plus is a water vapor transmission rate (WVTR) testing system designed to assess barrier materials used in packaging applications. By testing barrier materials for WVTR under a range of conditions, these systems enable you to select the best packaging material, at the best cost.
The Plus features a series of technological enhancements over prior models, including automatic relative humidity. It is faster and more stable, with increased upper and lower ranges, and 100 times greater sensitivity. These high sensitivity systems perform tests directly at the material's "real world" temperature and relative humidity.