“…They are made up of four layers: outer, filter, cotton, and inner. 80%–95 % for particles sized | Virus, germs, pollens, liquid-like sprays against non-oil particles | ( Yim et al, 2020 ) | FFP1 | Multilayer mask with a filter element and an exhalation valve | 80% | Environmental dust mask | ( Lepelletier et al, 2020 ) |
FFP2 | 94% | Virus, bacteria, powdered chemicals, dust |
FFP3 | 99% | Droplet aerosols, dust protein molecules, viruses, bacteria, fungi and spores, asbestos particles |
Cloth Face Mask | Cotton is the most common textile. It consists of three layers, one of which is hydrophilic. |
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