Understanding Air Permeability in Textiles
Air permeability describes how easily air passes through a textile under a specified pressure difference. It impacts comfort, breathability, and performance across garments and technical textiles.
Importance in Sportswear
In sportswear, appropriate air permeability helps manage heat and moisture. Too high can reduce wind resistance; too low can trap heat.
Air Permeability vs. Breathability
Breathability is often used broadly; air permeability is a measurable property. Many workflows evaluate both air and moisture vapor transmission.
Methods of Air Permeability Testing
Test methods differ by standard (e.g., ISO/ASTM) and define specimen size, pressure differential, and reporting units.
Step-by-Step Guide
- Condition specimens under specified temperature/humidity.
- Mount fabric to prevent leakage and edge effects.
- Apply differential pressure and record airflow.
- Repeat across multiple locations; compute average and variance.
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