Research On Testing Method Of High Efficiency Filter Media

With the development of modern science and technology, people have highercontrol in quantity and size of particles in air than before. So we have to producehigh efficiency air filter media to meet these requirements. However the premise ofmaking high efficiency filter media is the testing method of the efficiency for filtermedia. The present China standard has not been amended for many years and isn'tadapted to the development of filter media. Therefore according to EuropeanStandard-EN1822, which is popular in world, we build the test system, and mark theefficiency of filter media with most penetrating particle size. According to EN1822, we chose suitable testing equipments and build the testsystem. The building procedure of test system mainly consists of the design oftesting system, the selection of aerosol production system, counting systemoptimization and the establishment of sample air dilute system. Through the analysis of testing results and the calculation of testing error, weprove the stability and repeatability of most penetrating particle size test system. Weverify the relation between airflow velocity and media filtration efficiency and theinfluence of airflow velocity to most penetrating particle size. We also illuminatethe importance of airflow velocity in the test of filter media. In addition we did round-robin test for different kinds of HEPA filter media inrepresentative testing system to demonstrate possible variations, which includesodium flame test system, oil dust testing system, TSI8130 and ATI Q127 and so on.We analysis the test results, expound the current status of filter media testing andprove that the most penetrating particle size test system is advanced. Finally, after building our MPPS test system and comparing different testmethods, we can conclude it is necessary to introduce most penetrating particle sizetesting method into China HEPA filter media testing standard to meet thedevelopment of filter media.