Measurement of air permeability
Air Permeability of untreated and PADEP-coated
cotton fabric was studied using the Frazil Type Auto
Air Permeability Tester Model AP-360D according to
ASTM D737 : 1996.20 The sample test area was
6.9 cm2 and the air flow rate was automatically
adjusted to provide a pressure differential of at least
125 Pa across the fabric sample. The results of the
fabric were expressed in volume of air permeability
per second per fabric area (cm3
/s/cm2
). The reported
result was the average from measurements
on four samples.