Navigating Performance Standards for Face Mask Materials: A Custom-Built Apparatus for Measuring Particle Filtration...

Area of Science:

• Public Health
• Materials Science
• Engineering

Background:

• Community face mask usage is recommended by public health agencies to mitigate airborne disease transmission, such as COVID-19.
• Accurate evaluation of mask particle filtration efficiency (PFE) is critical for effective virus transmission reduction.
• Existing PFE testing systems are costly and time-consuming, creating a need for accessible, custom solutions.

Purpose of the Study:

• To develop and describe an "in-house" system and methodology for testing the particle filtration efficiency (PFE) of face masks.
• To ensure the developed system aligns with established standards for medical face mask PFE testing, specifically referencing ASTM International guidelines.
• To provide a flexible and adaptable PFE testing approach for various filter materials and conditions.

Main Methods:

• The study details the development of a custom PFE test system.
• The system utilizes a laser particle analyzer to measure particle concentrations upstream and downstream of the mask material.
• An aerosol of 0.1 µm nominal size latex spheres is employed, following ASTM International standards.

Main Results:

• The developed in-house system successfully measured PFE for various common fabrics and medical masks.
• The methodology demonstrated adherence to current PFE testing standards for medical masks.
• The system offers flexibility for adaptation to evolving filtration needs and conditions.

Conclusions:

• The described in-house PFE testing system offers a viable, cost-effective alternative to commercial systems.
• This approach facilitates compliance with existing PFE testing standards while allowing for customization.
• The developed method supports ongoing research and quality control for face mask filtration performance.