TAPPI T 547 om-12 provides a detailed laboratory procedure for measuring the air permeance of paper and paperboard using a controlled pressure differential and Sheffield air-flow apparatus. The method covers scope, equipment, calibration, sampling, specimen conditioning, testing procedures, reporting requirements, precision data, unit conversions, and calibration procedures for flow tubes and orifices. It is intended for quality control, production monitoring, laboratory testing, and comparison of paper properties related to porosity, absorbency, fiber structure, and filtering performance. This seven-page PDF standard is suitable for paper manufacturers, testing laboratories, quality professionals, engineers, and researchers.
Application Scope: Applies to the measurement and evaluation of air permeance in paper and paperboard specimens using the Sheffield method, including calibration and reporting of test results.
