Abstract
In the international standardization of air filters, there are two existing national standards accepted world-wide. They are similar but very much different in test dusts and measuring instruments, resulting in serious confusion among users as well as manufacturers. ISO/TC142 tries to mitigate much of the confusion caused by a multiplicity of national standards. Japanese mirror committee has proposed the usage of JIS-11 (JIS Z 8901) test dust as a substitute of currently-adopted test dusts for both initial collection efficiency measurements and loading dust since it has wide size distribution covering 0.3-5 μm. The present work studied the generation method of JIS-11 dust, the size distribution, the influence of charging state on the initial filter collection efficiency, and the relationship between light-scattering equivalent diameter and aerodynamic particle diameter. As a result, it was suggested that JIS-11 dust can be used for the measurements of initial collection efficiency covering particle diameter ranging from 0.3 to 5 μm.
