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What is air permeability?

Air permeability measures how easily air is passed through fabric. It indicates the breathability of weather-resistant and waterproof fabrics and is an important factor in the performance of materials like industrial curtains, sails, airbags and parachutes.

The main influences on air permeability are the density of the material and its structure. Fabrics can be coated to modify their air permeability.
The test method mainly consists of two kinds: constant pressure difference measurement and constant flow pressure difference. The constant pressure difference measurement method is to keep the constant pressure difference on both sides of the sample, and calculate the air permeability of the sample through testing the air flow of the sample in a certain time.

 The principle of constant flow pressure difference is to keep the air flow constant through the sample, and through the test, the pressure difference on both sides of the sample is tested, and the air permeability of the sample is obtained. In this paper, constant pressure difference measurement is used.

Air permeability is defined by the volume of air in cubic centimeters (cm3) which is passed through in one second through 100cm2 of the fabric at a pressure difference of 10cm head of water.indicates the breathability of weather-resistant and waterproof fabrics and is an important factor in the performance of materials like industrial curtains, sails, airbags and parachutes. The main influences on air permeability are the density of the material and its structure.

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