Discrepancy of particle passage in 101 mask batches during the first year of the Covid-19 pandemic in Germany.
Sci Rep
; 11(1): 24490, 2021 12 29.
Artículo
en Inglés
| MEDLINE | ID: covidwho-1594104
ABSTRACT
During the first wave of Covid-19 infections in Germany in April 2020, clinics reported a shortage of filtering face masks with aerosol retention> 94% (FFP2 & 3, KN95, N95). Companies all over the world increased their production capacities, but quality control of once-certified materials and masks came up short. To help identify falsely labeled masks and ensure safe protection equipment, we tested 101 different batches of masks in 993 measurements with a self-made setup based on DIN standards. An aerosol generator provided a NaCl test aerosol which was applied to the mask. A laser aerosol spectrometer measured the aerosol concentration in a range from 90 to 500 nm to quantify the masks' retention. Of 101 tested mask batches, only 31 batches kept what their label promised. Especially in the initial phase of the pandemic in Germany, we observed fluctuating mask qualities. Many batches show very high variability in aerosol retention. In addition, by measuring with a laser aerosol spectrometer, we were able to show that not all masks filter small and large particles equally well. In this study we demonstrate how important internal and independent quality controls are, especially in times of need and shortage of personal protection equipment.
Texto completo:
Disponible
Colección:
Bases de datos internacionales
Base de datos:
MEDLINE
Asunto principal:
COVID-19
/
Máscaras
Límite:
Humanos
País/Región como asunto:
Europa
Idioma:
Inglés
Revista:
Sci Rep
Año:
2021
Tipo del documento:
Artículo
País de afiliación:
S41598-021-03862-z
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