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. 2022 Mar 11;12(6):925. doi: 10.3390/nano12060925

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Filtration efficiency of a PET-based surgical mask prepared in this work compared to a commercial surgical mask. The polydispersity range of particles used in the EN 14683:2019 surgical mask test is marked in red, and the range used in the EN 149:2001 standard, applicable to FFP2 (similar to KN95) and FFP3 (similar to KN99) masks, is marked in yellow. Labels for filtration efficiency at specific diameters (100, 300, 500, and 700 nm) can be seen on the graph. (b) The contact angle of the materials obtained compared to a commercial surgical mask.