Air permeability is a widely used test which measures how easily air is passed through fabric and helps to indicate the fabric’s breathability, particularly for wind-resistant, weather-resistant and waterproof fabrics.

It is an important factor in measuring both the porosity and density of fabric, and assessing the performance of materials like industrial curtains, sails, airbags, and parachutes for a variety of end uses such as military, industrial, medical, automotive and sports/outdoor apparel.

In outdoor clothing, it is especially important for the material’s air permeability to be as low as possible because it should function as protection from wind. Moreover, the performance of nonwoven materials which are used as breathable liners, PPE and filters, is impacted by their permeability to air.

Air permeability is a suitable test for comfort because the breathability of a material is very important. That includes the flow of air through the garment and its sensorial impact on the skin. For example, items such as raincoats, hiking trousers and tents require low air and water permeability to provide resistance to wind and moisture (water and water vapours), which would impact not only the wearer’s comfort, but also the safety and performance of the garment.”

Standard

EN ISO 9237 , ASTM D737, GB/T 5453, JIS L 1096:2010 – test 8.26 Method C, BS 3424-16, NWSP 70.1, BS EN ISO 9073-15