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The air permeability of fabric


Fabric air permeability is a measure to what extent it gives air passing through the fabric. Air permeability, a given area in the vertical direction of the air flow rate, a given time period, as measured by the fabric test area inside the pressure difference of the fabric. Basically, it depends on weight, thickness and porosity of fabric. The porosity of fabric is the demonstration of the air gap as a percentage within the fabric. It has been important for especially the tent fabric and parachute.


The air permeability of a fabric is the volume of air measured in cubic centimeters passed per second through 1 cm2 of the fabric at a pressure of 1 cm of water.The air resistance of a fabric is the time in seconds for 1 cm3 of air to pass through 1cm2 of the fabric under a pressure head of 1 cm of water. Air resistance is the reciprocal of air permeability.


The reciprocal of air permeability, air resistance, can be defined as the time in seconds for ImI of air to pass through 100s mm2 of fabric under a pressure head of 10mm of water. The advantage of using air resistance instead of air permeability to characterize a fabric is that in an assembly of a number of fabrics, the total air resistance is then the sum of the individual air resistance.

Auto Air Permeability Test Apparatus for Fabric is used for fast, simple, and accurate determination of the air permeability of all kinds of flat materials and of foam cubes. The measuring range covers dense papers and airbag fabrics as well as extremely open non-wovens and forming fabrics.

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