Table 1 Masks tested in this study.
From: Filtration efficiency of medical and community face masks using viral and bacterial bioaerosols
Type of mask | Medical face mask type IIR (MFM) | Community face mask type I (CFM1) | Community face mask type II (CFM2) |
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Main features of the mask structure | 3 layers of non-woven polypropylene fibers (spunbound, meltblown, and spunbound layers) Pore size of the spunbound layer ≈ 100 µm Pore size of the meltblown layer ≈ 20 µm Fiber diameter of the spunbound layer = 25 ± 1 µm Fiber diameter of the meltblown layer = 6 ± 3 µm | CFM is made up 2 different layers Pore size of the inner layer ≈ 300 µm Pore size of the outer layer ≈ 50 µm Fiber diameter of the inner layer = 31 ± 5 µm Fiber diameter of the outer layer = 18 ± 1 µm | CFM is made up 2 identical layers Pore size ≈ 200 µm Fiber diameter = 18 ± 0 µm |
Electron microscopy images of the microscopic structure Scale bars correspond to 30 µm (MFM) or 10 µm (CFM) 400× magnification |
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Optical microscopy images of the microscopic structure Scale bars correspond to 300 µm 4× magnification |
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Expected conformity in term of filtration efficiency from the manufacturer | > 98% of BFE | > 90% of PFE | > 70% of PFE |
EN14683:2019 standard | AFNOR SPEC S76-001 requirement | ||
