Air Permeability How to Read It on a Lab Report
Laboratory reports present Air Permeability in a compact format. Knowing what each line means prevents misreading.
Definition reminder
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.
Common report layout
The report states method ISO 9237 air permeability, sample description, conditioning, and the measured result. 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.
Typical result
Values near 50-500 mm/s depending on structure usually indicate a conforming lot, assuming the fabric matches the sample submitted. 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.
Red flags
Missing revision numbers, unusual conditioning, and results without units all signal unreliable data. 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.
Questions to ask
Ask the laboratory for the standard revision and sample description before accepting or rejecting a result. 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.
