The air permeability test method is based on the Kozeny equation. Weighed fibres (test specimen) are introduced in a measuring chamber with known volume. Air is passed through this test specimen. A scale indicating variations in permeability of air may be calibrated in appropriate absolute units of rate of flow or pressure difference and a table or graph is provided for conversion of the observed reading into values of mean diameter of the measured wool fibres.
WITHDRAWN
ISO 1136:1976
95.99
Withdrawal of Standard
Mar 3, 2015
PUBLISHED
ISO 1136:2015
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