Comparison of HEPAULPA Filter Test Standards Between USA and Europe.pdf

Comparison Of HEPA/ULPA Filter Test Standards Between America And Europe Bin Zhou, Jinming Shen Heating, Ventilation, Air-conditioning and Gas Institute, Tongji University, Shanghai, China Corresponding email: zhoubinwx@126.com SUMMARY This paper compares the difference of HEPA/ULPA filter test standards between America and Europe from test procedures, aerosol types and its size, to air filter classification. Both of them adopt MPPS method as their trend. According to EN1822, it is recommended to combine the test rigs for efficiency test and leakage test in practice. Influence of different scanning velocity on sampling accuracy, leakage and efficiency test accuracy need further studied and reasonable scanning velocity should be fixed. According to Rongyi Zhao’s theoretical analysis, dilution method to test high test aerosol concentration may not be correct, and reasonable test methods instead of dilution need to be further studied. INTRODUCTION High efficiency particulate air filters (HEPA) and ultro-low penetrating particulate air filter (ULPA) are widely used in pharmacy, hospital, food processing and microelectronics, they are one of the most important terminals in clean space. In order to guarantee product quality and environmental control, every country makes its strict test standards. During the late 1950s, China adopted oil mist method from USSR. At the early 1960s, oil mist method was improved to meet requirement of collective safeguard equipment and the development of atomic energy engineering. In 1963 and 1965, sodium flame test rig was successfully developed respectively to test filter media and HEPA. In 1970s, especially after the economic reform and opening-up policy, oil mist method and sodium flame method were used widely, therefore in 1980s national standard GB6165 was made using both methods. As the development of microelectronics, the orginal standards using sodium salt and oil mist are old-fashioned. Befor