No face mask is 100% effective. Masks are a trade-off between bacterial and particle efficiency and user comfort, with a 97.5% bacterial filter efficiency the typical rating. Achieving this is dependent upon the mask integrity and worn correctly. This paper covers cleanroom contamination control, more recent research within the medical field has been completed and this can be applied to the pharmaceutical sector.
One reason for the lack of information pertaining to face mask release in terms of droplets as well as the combination of factors that influence the duration of face mask wearing in the cleanroom context is because most of the research has been in the medical field.
Sandle, T. (2021) Face Mask Controls and Duration of Wearing: What Medical Research Can Teach the Cleanroom Manager, Journal of GxP Compliance, 25 (3): https://www.ivtnetwork.com/article/face-mask-controls-and-duration-wearing-what-medical-research-can-teach-cleanroom-manager DOI: 10.1080/21506590.25352021TS-FMCDW
Posted by Dr. Tim Sandle, Pharmaceutical Microbiology Resources (http://www.pharmamicroresources.com/)
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