The aspiratory resistance and filtration penetration of N95 filtering-facepiece respirators used widely in China / 中华劳动卫生职业病杂志
Chinese Journal of Industrial Hygiene and Occupational Diseases
; (12): 3-6, 2015.
Article
em Zh
| WPRIM
| ID: wpr-289746
Biblioteca responsável:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>The objective of this study was to investigate the aspiratory resistance, filtration penetration and their influence factors of N95 filtering-facepiece respirators used widely in China.</p><p><b>METHODS</b>The total of 6 brands and 21 models of N95 filtering-facepiece respirators which are certified and big sales on the market. The aspiratory resistance and filtration efficiency filter penetration were measured while air pump ran from 10 L/min to 100 L/min using differential pressure gauge and the PortaCount, respectively.</p><p><b>RESULTS</b>The filtration penetrations for 2 of the 21 models were lower than 95%, and the qualified rate for all models was 90.47%. The filtration penetrations gradually decreased when ventilation flow of air pump increased. The negative correlation was observed between filtration penetration and ventilation flow (r(2) = 0.711, P < 0.05). The resistances of all 21 models of N95 respirators met the requirements of the national standard. The aspiratory resistance started to elevate with the increasing of ventilation flow, and a positive correlation between both (r(2) = 0.878, P < 0.05). Significant differences of filtration penetration and aspiratory resistance were observed among between different brands (P < 0.05) although no differences of filtration penetration existed among different models of one brand (P > 0.05). But the differences of the aspiratory resistance among different models of one brand were statistically significant (P < 0.05).</p><p><b>CONCLUSION</b>The aspiratory resistances of all N95 filtering-facepiece respirators used in this study met the requirements of the national standard. And the qualified ratio of filtration penetration of all models was higher than 90%. The influencing factors of aspiratory resistance included materials, size and ventilation flow. And influencing factors for filtration penetration were materials and ventilation flow.</p>
Texto completo:
1
Índice:
WPRIM
Assunto principal:
Padrões de Referência
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Dispositivos de Proteção Respiratória
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Teste de Materiais
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China
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Poluentes Ocupacionais do Ar
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Desenho de Equipamento
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Filtração
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Máscaras
Tipo de estudo:
Prognostic_studies
País/Região como assunto:
Asia
Idioma:
Zh
Revista:
Chinese Journal of Industrial Hygiene and Occupational Diseases
Ano de publicação:
2015
Tipo de documento:
Article