TAPPI T 464 OM 2012

A TAPPI test method for measuring the water vapor transmission rate of paper and paperboard under high-temperature, high-humidity conditions.

TAPPI T 464 om-12 provides a gravimetric procedure for determining the water vapor transmission rate of paper and paperboard at 37.8°C (100°F) and 90% relative humidity. The method covers scope, significance, definitions, apparatus, materials, specimen preparation, conditioning, testing procedures, calculation, reporting, precision, and related methods. It is suitable for evaluating the moisture-barrier performance of sheet materials, including creased and uncreased specimens, using sealed test dishes, desiccant, controlled temperature and humidity, and analytical weighing. The document is provided as a five-page PDF technical standard for laboratory testing and quality control.

Application Scope: Paper mills, packaging manufacturers, testing laboratories, research organizations, and quality-control teams evaluating moisture protection and water vapor transmission in paper, paperboard, containerboard, and related sheet materials.