Standard test method for types and filtration efficiency of air filtration materials

There are numerous kinds of air filters. According to its appearance, it can be divided into granular air filtration material, foam air filtration material, microporous membrane air filtration material and nonwoven fiber air filtration material. No matter what form of filter material, the basic filter performance evaluation index mainly includes filtration efficiency, resistance pressure drop (piezoresistive), quality factor and dust capacity. ​The History Ceramic Foam Filtration Slice can also be interpreted in this way.

12a2be55ce2d893be29b6b04ce698bc5There are five main test methods for filtration efficiency, namely sodium flame method, oil mist method, colorimetric method, atmospheric dust weight method and counting method. Based on filtration efficiency, air filtration materials can be further classified in order to more intuitively define the efficiency and application of the material. Drag pressure drop is the gas pressure difference between upstream and downstream of the filter material. Because the continuous dust content of the filter material in the use process will affect the gas flow, the pressure of the filter material should not only test its initial value, but also monitor the changes in the long-term use process.

In general, as the filtration progresses, the piezoresistive resistance of the material will increase, and the energy consumption of the filtration material will also increase. According to the Chinese national standard GB/T 14295-2008, when the resistance value increases to twice the initial resistance value, the filter material is considered to have been used. Quality factor (QF) is a performance index considering filtration efficiency and resistance pressure drop. It is commonly used as a balance indicator of filtration performance. Therefore, it can be claimed that the higher the quality factor of the material, the better the filtration performance. Dust holding capacity refers to the total amount of particles contained in the filter material during use. According to G calculation, the higher the dust holding capacity, the longer the service life.

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