Article ID: JOSH-2019-0007-TA
We evaluated the particle collection efficiencies of four types of polytetrafluoroethylene (PTFE)-coated glass fiber filters. The efficiencies were tested with 10 sizes of monodispersed aerosols from 30 to 500 nm. The efficiencies
corresponding to each particle size were obtained by measuring particle number concentrations upward and downward of the filter set in the NWPS-254 sampler. The results showed that each filter satisfied the efficiency of more than
95% for particle size of 300 nm under the Working Environment Measurement Standards of Japan. On the other
hand, the efficiencies ranged from 87.0% to 99.7% when particle size was approximately 100 nm.
