ARENA case study in Aerosol Filtration Efficiency of Reusable Face Masks
The study showed that ADKN face masks when used without a PM2.5 insert can provide filtering efficiencies for capturing particulate matters larger than ∼1μm to 10μm in the range of 2-3%, as shown in Figure 4. This is a relatively low level and can be attributed mainly to the physical barriers provided by the mask bamboo and RPET materials. However, when they are used with PM2.5 inserts, the filtering efficiency increases to levels around 30% for PM2.5 and PM10 which is above those measured for common surgical masks at around 20%.
The next stage of this study involves investigating the impact of washing on ADKN mask filtering efficiencies and capturing mechanisms using optical and electron microscopy.
[i]Konda, A., et al., 2020. Aerosol filtration efficiency of common fabrics used in respiratory cloth masks. ACS nano, 14(5), pp.6339-6347.
[ii] Schilling, K., et al., 2020. An Accessible Method for Screening Aerosol Filtration Identifies Poor-Performing Commercial Masks and Respirators.