TAPPI T 448 om-09 provides a gravimetric procedure for measuring the water vapor transmission rate of paper, paperboard, and related sheet materials under controlled conditions. The method covers scope, significance, apparatus, materials, specimen preparation, testing procedures, calculations, reporting requirements, precision, and related standards.
This PDF is intended for laboratories, packaging manufacturers, paper and paperboard producers, quality professionals, and researchers evaluating moisture barrier performance. It includes guidance for testing creased and uncreased specimens, sealing test dishes with wax, conditioning samples, recording mass changes, calculating WVTR, and reporting average, maximum, and minimum results.
Application Scope: Moisture barrier testing and quality evaluation of paper, paperboard, packaging sheets, and related materials in laboratory and industrial environments.
