Filtration efficiency of a large set of COVID-19 face masks commonly used in Brazil
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Aerosol Science and Technology
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The use of face masks is mandatory in public places in many countries to slow the spread
of the COVID-19 pandemic. In developing countries, homemade masks with varying techniques
and fabrics are used on the streets. On these fabric masks, the protection against
SARS-CoV-2 varies significantly. The most common mask types are N95, surgical masks, and
homemade nonwoven and cotton masks. The performance of 227 different face masks used
in Brazil was evaluated to quantify their breathability and filtration efficiency (FE) for airborne
particles. FE values were measured using NaCl aerosol particles sized from 60 to
300nm and at 300 nm, minimum efficiency. The differential pressure drop over the mask
and the FEmin at 300nm was used to calculate the mask Quality Factor (QF). The N95 masks
showed the highest FE60-300, around 0.98, and a QF of 13.2 KPa-1, and were considered the
reference for evaluating homemade masks performance. Surgical masks have an FE60-300 of
0.89, with a good QF of 15.9 KPa-1. Nonwoven masks showed an average FE60-300 of 0.78,
with an excellent QF of 24.9 KPa-1, and can be regarded as the best material for homemade
masks. The most commonly used material for homemade masks, cotton fabrics, showed significant
variability in FE60-300, ranging from a low 0.20–0.60, with a low QF of 1.4 KPa-1.
Masks always reduce droplets and aerosols emitted by COVID-19 symptomatic and asymptomatic
persons, reducing SARS-CoV-2 contamination.
Como referenciar
MORAIS, FERNANDO G.; SAKANO, VICTOR K.; LIMA, LUCAS N. de; FRANCO, MARCO A.; REIS, DANIEL C.; ZANCHETTA, LIZ M.; JORGE, FABIO; LANDULFO, EDUARDO; CATALANI, LUIZ H.; BARBOSA, HENRIQUE M.J.; JOHN, VANDERLEY M.; ARTAXO, PAULO. Filtration efficiency of a large set of COVID-19 face masks commonly used in Brazil. Aerosol Science and Technology, v. 55, n. 9, p. 1028-1041, 2021. DOI: 10.1080/02786826.2021.1915466. Disponível em: http://repositorio.ipen.br/handle/123456789/32306. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.