Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:

ASTM D737 – Air Permeability of Textile Fabrics

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ASTM D737 testing covers the measurement of the air permeability of textile fabrics. This test method applies to most fabrics including woven fabrics, nonwoven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, and pile fabrics. The fabrics can be untreated, heavily sized, coated, resin-treated or otherwise treated.

The rate of air flow passing perpendicularly through a known area of fabric is adjusted to obtain a prescribed air pressure differential between the two fabric surfaces. From this rate of air flow, the air permeability of the fabric is determined.

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