Air permeance (Gurley)
The determination of air permeance according to Gurley or Bendtsen is carried out by means of air flow at a given pressure differential. It is a characteristic value for paper and board.
In short — AI-generated
The Gurley and Bendtsen methods measure the air permeability of paper and board by determining the volume of air that passes through a defined surface area under a constant pressure difference. The test records the time required for a specific volume of air to flow through the material or the rate of airflow at a set pressure.
The resulting value indicates the porosity and density of the material, which are critical for assessing its suitability for printing, coating, or lamination processes. In practice, this data helps developers predict how a material will interact with adhesives or barrier coatings during packaging production.
Text is AI-generated; based on test method data curated and verified by Innoform.