Influence of microstructure and physical characteristics in the performance of non-professional masks sold in São Paulo.

Autor: Lima LN; National Institute of Advanced Eco-efficient Technologies in Cementitious Products, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil; Department of Civil Construction, Polytechnic School, University of São Paulo, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil. Electronic address: lucas.lima@lme.pcc.usp.br., Reis DC; National Institute of Advanced Eco-efficient Technologies in Cementitious Products, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil; Department of Civil Construction, Polytechnic School, University of São Paulo, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil. Electronic address: daniel.reis@lme.pcc.usp.br., Sakano VK; National Institute of Advanced Eco-efficient Technologies in Cementitious Products, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil; Department of Civil Construction, Polytechnic School, University of São Paulo, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil. Electronic address: victor.sakano@lme.pcc.usp.br., Franco MA; Institute of Physics, University of São Paulo, R. do Matão, 1371 Butantã, São Paulo, São Paulo, 05508-090, Brazil. Electronic address: marco.franco@usp.br., Morais FG; Institute of Physics, University of São Paulo, R. do Matão, 1371 Butantã, São Paulo, São Paulo, 05508-090, Brazil; Institute of Energy and Nuclear Research, Av. Prof. Lineu Prestes, 2242 - Butantã, São Paulo, São Paulo, 05508-000, Brazil. Electronic address: fmorais@usp.br., John VM; National Institute of Advanced Eco-efficient Technologies in Cementitious Products, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil; Department of Civil Construction, Polytechnic School, University of São Paulo, Av. Prof. Luciano Gualberto, 380 Butantã, São Paulo, São Paulo, 05508-010, Brazil; U.S.P. Innovation Center, INOVAUSP, Av. Prof. Lúcio Martins Rodrigues, 370 - Butantã, São Paulo, São Paulo, 05508-020, Brazil. Electronic address: vanderley.john@lme.pcc.usp.br.
Jazyk: angličtina
Zdroj: Public health [Public Health] 2022 Apr; Vol. 205, pp. 90-98. Date of Electronic Publication: 2022 Mar 03.
DOI: 10.1016/j.puhe.2022.01.009
Abstrakt: Objectives: This study evaluates the performance of eight non-professional face masks sold in São Paulo, Brazil, to prevent aerial transmission of the SARS-CoV-2.
Study Design: This was a case report with comparative testing.
Methods: The masks manufactured with different materials and designs were quantified according to their performance to prevent COVID-19 using two indicators: filtration efficiency (FE) and differential pressure. The fabric grammage and microscopy of the layers were analyzed to understand their influence on the performance indicators.
Results: The results show no correlation between grammage in the FE and increasing grammage can compromise breathability indicator. Masks manufactured with cotton widely commercialized during the pandemic have non-uniformized results in FE indicators.
Conclusions: There was no evidence between grammage and the number of layers in the FE indicator. The results pointed out that the layer's composition and the microstructure are the best way to evaluate the performance of non-professional masks used to prevent the aerial transmission of the SARS-CoV-2.
(Copyright © 2022 The Royal Society for Public Health. Published by Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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