Navigating Performance Standards for Face Mask Materials: A Custom-Built Apparatus for Measuring Particle Filtration Efficiency,Global Challenges

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Navigating Performance Standards for Face Mask Materials: A Custom-Built Apparatus for Measuring Particle Filtration Efficiency
Global Challenges ( IF 4.4 ) Pub Date : 2021-08-05 , DOI: 10.1002/gch2.202100052
Ryan J LaRue _{1,

2} , Patrick Morkus _{1,

2} , Scott Laengert _{1,

2} , Sarah Rassenberg _{1,

2} , Mohamad Amin Halali _{1,

2} , John W Colenbrander _{1,

3} , Catherine M Clase _{1,

4,

5,

6} , David R Latulippe _{1,

2} , Charles-François de Lannoy _{1,

2}

Affiliation

Public health agencies have recommended the community use of face masks to reduce the transmission of airborne diseases like COVID-19. Virus transmission is reduced when masks act as efficient filters, thus evaluating mask particle filtration efficiency (PFE) is essential. However, the high cost and long lead times associated with purchasing turn-key PFE systems or hiring certified laboratories hampers the testing of filter materials. There is a clear need for “custom” PFE test systems; however, the variety of standards that prescribe (medical) face mask PFE testing (e.g., ASTM International, NIOSH) vary widely in their protocols and clarity of guidelines. Herein, the development is described of an “in-house” PFE system and method for testing face masks in the context of current standards for medical masks. Pursuant to the ASTM International standards, the system uses an aerosol of latex spheres (0.1 µm nominal size) with particle concentrations upstream and downstream of the mask material measured using a laser particle analyzer. PFE measurements are obtained for a variety of common fabrics and medical masks. The approach described in this work conforms to the current standards for PFE testing while providing the flexibility to adapt to changing needs and filtration conditions.

中文翻译：

探索口罩材料的性能标准：用于测量颗粒过滤效率的定制设备

公共卫生机构建议社区使用口罩，以减少 COVID-19 等空气传播疾病的传播。当口罩充当高效过滤器时，病毒传播就会减少，因此评估口罩颗粒过滤效率（PFE）至关重要。然而，购买交钥匙 PFE 系统或雇用经过认证的实验室的成本高且交货时间长，阻碍了过滤材料的测试。显然需要“定制”PFE 测试系统；然而，规定（医疗）面罩 PFE 测试的各种标准（例如 ASTM International、NIOSH）的协议和指南的清晰度差异很大。在此，描述了在当前医用口罩标准的背景下用于测试口罩的“内部”PFE 系统和方法的开发。根据 ASTM 国际标准，该系统使用乳胶球气溶胶（标称尺寸为 0.1 µm），并使用激光颗粒分析仪测量面罩材料上游和下游的颗粒浓度。对各种常见织物和医用口罩进行 PFE 测量。这项工作中描述的方法符合当前的 PFE 测试标准，同时提供了适应不断变化的需求和过滤条件的灵活性。

更新日期：2021-08-05

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