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==== Air permeability ====
Air permeability refers to the fabric's porosity or its ability to allow air to pass through it. A standardised testing procedure is crucial for various fabrics as it uncovers fundamental qualities such as warmth in blankets and air resistance in parachute cloth.
The air permeability test method is for measuring the ability of air to pass through textile materials.<ref>{{cite web|title=Standard Test Method for Air Permeability of Textile Fabrics|url=https://csbs.uni.edu/sites/default/files/Air_Permeability.pdf|url-status=live|access-date=2021-07-03|archive-date=2021-07-09|archive-url=https://web.archive.org/web/20210709183255/https://csbs.uni.edu/sites/default/files/Air_Permeability.pdf}}</ref>
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