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首页> 美国卫生研究院文献>other >Comparison of Simulated Workplace Protection Factors Offered by N95 and P100 Filtering Facepiece and Elastomeric Half-Mask Respirators against Particles of 10 to 400 nm
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Comparison of Simulated Workplace Protection Factors Offered by N95 and P100 Filtering Facepiece and Elastomeric Half-Mask Respirators against Particles of 10 to 400 nm

机译：N95和P100过滤面罩和弹性半面具呼吸器针对10至400 nm颗粒提供的模拟工作场所保护因素的比较

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This study compared the simulated workplace protection factors (SWPFs) between NIOSH-approved N95 respirators and P100 respirators, including two models of filtering facepiece respirator (FFR) and two models of elastomeric half-mask respirator (EHR), against sodium chloride particles (NaCl) in a range of 10 to 400 nm.Twenty-five human test subjects performed modified OSHA fit test exercises in a controlled laboratory environment with the N95 respirators (two FFR models and two EHR models) and the P100 respirators (two FFRs and two EHRs). Two Scanning Mobility Particle Sizers (SMPS) were used to measure aerosol concentrations (in the 10–400 nm size range) inside (Cin) and outside (Cout) of the respirator, simultaneously. SWPF was calculated as the ratio of Cout to Cin. The SWPF values obtained from the N95 respirators were then compared to those of the P100 respirators.SWPFs were found to be significantly different (P<0.05) between N95 and P100 class respirators. The 10th, 25th, 50th, 75th and 90th percentiles of the SWPFs for the N95 respirators were much lower than those for the P100 models. The N95 respirators had 5th percentiles of the SWPFs > 10. In contrast, the P100 class was able to generate 5th percentiles SWPFs > 100. No significant difference was found in the SWPFs when tested against nano-size (10 to 100 nm) and large-size (100 to 400 nm) particles.Overall, the findings suggest that the two FFRs and two EHRs with P100 class filters provide better performance than those with N95 filters against particles from 10 to 400 nm, supporting current OSHA and NIOSH recommendations.
机译：这项研究比较了NIOSH批准的N95呼吸器和P100呼吸器之间的模拟工作场所保护因子（SWPF），包括两种过滤面罩呼吸器（FFR）和两种弹性半面罩呼吸器（EHR）对氯化钠颗粒（NaCl ）在10到400 nm的范围内.25位人体测试受试者在受控的实验室环境中使用N95防毒面具（两个FFR模型和两个EHR模型）和P100防毒面具（两个FFR和两个EHR）进行了改良的OSHA Fit测试练习。 ）。使用两个扫描流动粒度仪（SMPS）同时测量呼吸器内部（Cin）和外部（Cout）的气溶胶浓度（在10-400 nm尺寸范围内）。 SWPF计算为Cout与Cin之比。然后将N95呼吸器的SWPF值与P100呼吸器的SWPF值进行比较，发现N95和P100类呼吸器之间的SWPF显着不同（P <0.05）。第10 ，第25 ，第50 ，第75 和第90 N95防毒面具的SWPF百分位数远低于P100型号。 N95呼吸器的SWPF> 10的百分位数为5。相比之下，P100级呼吸器的SWPF> 100的百分位数为5。相对于纳米级（10至100 nm）和大型（100至400 nm）颗粒进行测试时，SWPF总体而言，研究结果表明配备P100级滤光片的两个FFR和两个EHR提供的性能要优于配备N95滤光片的性能针对10至400 nm的颗粒，支持当前的OSHA和NIOSH建议。

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