ASTM D Standard Test Method for Air Permeability of Textile Fabrics. What This Test is Used For: This test method covers the measurement of the air. ASTM D – Tensile, Compressive and Flexural Creep and . ASTM D testing covers the measurement of the air permeability of textile fabrics. This test. This standard is issued under the fixed designation D ; the number interest. 1 This test method is under the jurisdiction of ASTM Committee D13 on Textiles.
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The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. Air permeability also can be used to provide an indication of the breathability of weather-resistant and rainproof fabrics, or of coated fabrics in general, and to detect changes during the manufacturing process.
Yarn crimp and weave influence the shape and area of the interstices between yarns and may permit yarns to extend easily. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. asgm
As twist increases, the circularity and density of the yarn increases, thus reducing the yarn diameter and the cover factor and increasing the air permeability.
If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
Such yarn extension would open up the fabric, increase the free area, and increase the air permeability. For example, a worsted gabardine fabric may have lower air permeability than a woolen hopsacking fabric. Fabrics with different surface textures on either side can have a different air permeability depending upon the direction of air flow.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
It qstm the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Hot calendaring can be used to flatten fabric components, thus reducing air permeability.
In filtration, for example, efficiency is directly related to air permeability.
As a minimum, ensure the test samples to be used are as homogeneous as aastm, are drawn from the material from which the disparate test results were obtained, and are randomly assigned in equal number to each laboratory for testing.
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The values stated in inch-pound units may be approximate. Historical Version s – view previous versions of standard.