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NWSP 70.1 Air Permeability




NWSP 70.1


Air Permeability of Nonwoven Materials


The NWSP 70.1 Air Permeability test method covers the measurement of the air permeability of nonwoven materials. This test applies to most fabrics, including woven fabrics, nonwoven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, and pile fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated.

SI values are regarded as the official standard system of measurement for this standard test method.


The rate of flow of air passing perpendicularly through a given area of fabric is measured at a given pressure difference across the fabric test area over a given time period.

Air permeability is an important factor in the performance of nonwoven products, i.e. air and gas filters made from different processes, several different types of protective clothing and vacuum cleaner bags. In protective clothing, for example, comfort as it relates to breathability is directly related to air permeability.


IPS uses a 125 Pa pressure differential unless a different pressure differential is specified by the customer. IPS conditions and tests at 50% RH and 23°C.


Please note:
SGS-IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.