The air permeability of clothing not only determines the comfortability of the wearer. It is a key feature to keep body warmth by blocking the severe wind and trapping the warm air between the skin and clothing to prevent heat loss from the body.
Wind resistance is the ability of a fabric to be resistant wind and reduce the wind pressure blowing in for protection. Wind-proof is the ability of a fabric to be impervious to wind and blocks out strong wind for protection. It can be determined by measuring the rate of air flow passing perpendicularly through a specific area of fabric.
Wind-resistant and wind-proof fabrics can offer protection to the wearer from severe winds and reduce the wind chill. Wind-proof textiles are extensively used to make wind-sheeters and jackets for bikers. They are also used in defense and aerospace industries for making special uniforms.
Good wind-resistant and wind-proof feature of textile products can prevent the person from losing heat in the cold weather as the cold air outside cannot penetrate into the clothing. It also reduces the air permeability to improve the comfortability of wearer under windy environment. The prevention of thermal static air outflow in the clothing should keep the wearer warm.
Wind-resistant and wind-proof properties of a fabric can be determined by the air permeability under a prescribed air pressure differential between the two surfaces of a material. The air flow rate passing perpendicularly through a given area of fabric is measured at a given pressure difference across the fabric test area over a given time period. The applicable methods include:
- ASTM D737
- ISO 9237
- GB/T 5453
- CNS 5612
- JIS L1096 8.26.1.A
- KS K 570
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