Textiles – Determination of permeability of fabrics to air (ISO ); German version EN ISO DIN EN ISO Determination of permeability of fabrics to air (ISO ). The ISO Air Permeability test describes a method for measuring the permeability of fabrics to air. It is applicable to most types of fabrics.
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When outdoors we are exposed to the prevailing weather conditions. The waterproofness of the membrane is measured on the basis of the water column under the pressure of which the material starts to allow water through it.
Sympatex – Membrane – Performance
According to EN a membrane is waterproof if it can resist a pressure of 1, mm. Pursuant to ISO the Sympatex membrane far exceeds these values and is extremely waterproof with a water column of over 45, mm.
Breathable clothing which removes perspiration in the form of water vapour from the skin supports a pleasant body climate and prevents overheating. In contrast to other membrane technologies, the poreless compact Sympatex membrane is based on a physical and chemical principle.
ISO – Textiles — Determination of the permeability of fabrics to air
The water-attracting hydrophilic part of the membrane absorbs the moisture from the isl and emits it to the outside by evaporation. The water vapour molecules are transported outwards along the hydrophilic molecule chains. The molecular structure hydrophilic components of the Sympatex membrane swells in moisture and therefore provides space for water vapour transport and fast evaporation.
This effect increases as the difference in temperature and moisture sn. The requirement for this function is a partial pressure gradient of the temperature and humidity from inside to outside.
This function property is important to avoid the wind chill effect. The wind removes the warming layer of air from around the body.
The perceived temperature is lower than the actual temperature. No wind chill effect with Sympatex membrane: The more your body sweats, the more moisture the membrane can transport outwards.
Performance of Sympatex Membrane
This is the resistance that a material has to water vapour. A RET value of less than 6 is described as very good breathability.
The Sympatex membrane achieves absolutely top values with RET values of up to 0. Optimal breathable Breathable clothing which removes perspiration in the form of water vapour from the skin supports a pleasant body climate and prevents fin.
ASTM D737 ISO 9237 LCD Display Fully Automatic Textile Fabric Air Permeability Testing Equipment
Function In contrast to other membrane technologies, the poreless compact Sympatex membrane is based on a physical and chemical principle. Wind chill effect The wind removes the xin layer of air from around the body. Dynamic climate control The more your body sweats, the more moisture the membrane can transport outwards.