Bacterial filtration efficiency

Bacterial Filtration Efficiency or BFE is a measurement of a respirator material's resistance to penetration of bacteria. Results are reported as percent efficiency and correlate with the ability of the fabric to resist bacterial penetration. Higher numbers in this test indicate better barrier efficiency. Wrap fabrics were compared based on grade as well as basis weight.

Measurement Methodology

Kimberly-Clark uses a test procedure where samples were challenged with a biological aerosol of Staphylococcus aureus and the results employ a ratio of the bacterial challenge counts to sample effluent counts, to determine percent bacterial filtration efficiency (%BFE).[1]

Surgical mask standards in China, Europe, and the United States measure BFE by using particles of size 3.0 μm.[2]

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gollark: The answer is 2, with a 150% margin of error.
gollark: It is not. As far as I know, the way it works (roughly) is that when you measure one thing in a pair, you know the other one must be in the other state; no way to transfer data that way unless you can already transfer the same amount of data to the other end.
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References
  1. http://www.kchealthcare.com/media/287706/h0486_0701_medlinevskc.pdf%5B%5D
  2. Robertson, Paddy (15 March 2020). "Comparison of Mask Standards, Ratings, and Filtration Effectiveness". Smart Air Filters.
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