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The difference of Air permeability test standards in different countries
Air permeability is the measure of air flow passed through a given area of a fabric. This parameter influences the thermal comfort properties of fabrics to a large extent. It is generally accepted that the air permeability of a fabric depends on its air porosity, which in turn influences its openness. With more porosity, more permeable fabric is obtained.
The pressure difference stipulated in the test standards of different countries is not consistent. In the United States, the ANSI/ASTM, D773, fs191/5450 and Japan’s JISL1096 are 127.4Pa (about 13mm water column).
The regulations of NF g07-111 in France are 196Pa (about 20mm water column). According to German DIN53887, clothing fabric is 100Pa (10mm water column), parachute fabric is 160Pa (16mm water column), filter fabric and industrial fabric is 200Pa (20mm water column). British BS5636 regulation is 98Pa (about 10mm water column); ISO9237 is the same as Germany;
China’s original standard GB 5453-85 is the same as that of the United States.
The new standard is the same as ISO. Due to the inconsistency of the pressure difference specified in the test standards, the conversion method of fabric permeability under different pressure difference conditions of FZ/ t01072-1999 was formulated for the convenience of conversion in China (original ZB W 55001-87). FZ/ t01072-1999 is applicable to the special industrial fabrics of cotton and brocade silk. The range of pressure difference is 3 ~ 19mmH2O.
People pay more and more attention to environmental protection. To achieve sustainable development, more efforts must be made to protect the environment and prevent excessive pollution to the environment. In this context, nonwoven filter materials started and developed rapidly. With the development of the research, the performance index and test method of the filter material will be more perfect. It is believed that in the near future, the quality standards of filter materials will be introduced, and the performance of filter materials will be improved to a new level.
2019-06-21 16:03
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