High Pressure Densometers are the accepted standard for measuring the porosity, air-permeability or air-resistance of materials having low permeability.
高压透气度测试仪经检验合格产品，用于测量低透水性材料的孔隙度、透气度和气阻。
The initial resistance of the filter medium decides the air permeability of the filter medium itself, but the resistance during operating is several times to the initial resistance.
滤料的初阻力决定于滤料本身的透气度，而运行中的阻力则比初阻力大许多倍。
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