METHOD AND DEVICE FOR MEASURING GAS PERMEABILITY THROUGH A POROUS MEMBRANE-LIKE MATERIAL

摘要

The invention relates to a method and device for measuring gas permeability through a porous membrane-like material, particularly through paper. In the method, a sample (N) is placed tightly against the edges of an open chamber (20), to which a gas connection is created to a source of constant pressure (18, 17), the predetermined pressure difference being used to create a stable flow of gas through the sample, and to measure at least one volume quantity, which is proportional to the gas permeability of the material. The flow of gas is throttled before being led to the chamber (20), which rapidly stabilizes the flow.