Air Permeability Why Shipments Get Rejected Over This
Many disputes come down to Air Permeability. Below is what inspectors check and why shipments fail.
The core definition
volume of air passing through fabric. Working figures for Air Permeability normally sit around 50-500 mm/s depending on structure in mainstream production. Note ISO 9237 air permeability on the tech pack so nobody tests against an older revision.
Most common cause of failure
Results usually fall outside 50-500 mm/s depending on structure because the target was never written into the order. Record elastane content alongside Air Permeability, because blends shift the measured value. A result outside 50-500 mm/s depending on structure usually points to process drift rather than to the fibre itself.
How it is checked
Inspection and laboratory work both refer to ISO 9237 air permeability. Keeping reference values for Air Permeability lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 9237 air permeability, since both affect the reading.
Related faults
it controls wind protection and cooling, so related complaints often point back to this single parameter. Working figures for Air Permeability normally sit around 50-500 mm/s depending on structure in mainstream production. Note ISO 9237 air permeability on the tech pack so nobody tests against an older revision.
Avoiding rejection
Agree targets, tolerances and the method before production, then test per lot rather than per shipment. Record elastane content alongside Air Permeability, because blends shift the measured value. A result outside 50-500 mm/s depending on structure usually points to process drift rather than to the fibre itself.
