The Powecom masks were tested by NIOSH/NPPTL 10x with 10 masks in each batch, test results can be found here [cdc.gov] which shows that they have well over 95% efficiency. These were TESTED but not APPROVED by NIOSH as the approval process is different and more complicated.
Direct links to results from the CDC Website:
- April 22, 2020 Minimum Filter Efficiency: 99.21% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- May 19, 2020 Batch 1 Minimum Filter Efficiency: 97.04% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- May 19, 2020 Batch 2 Minimum Filter Efficiency: 98.60% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- May 29, 2020 Minimum Filter Efficiency: 98.96% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- June 26, 2020 Minimum Filter Efficiency: 99.14% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- July 13, 2020 Minimum Filter Efficiency: 99.43% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- July 20, 2020 Minimum Filter Efficiency: 98.55% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- August 31, 2020 Minimum Filter Efficiency: 99.62% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- October 7, 2020 Minimum Filter Efficiency: 99.19% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
- December 2, 2020 Minimum Filter Efficiency: 99.35% https://www.cdc.gov/niosh/npptl/r...ed-508.pdf
Note that the testing done is only for the filter material, and does not account for proper fit. Many people may have difficulty achieving a proper fit/seal with the ear loop design which is why NIOSH Approved N95 masks all have the head band design. Bonefide does offer the head band design [bonafidemasks.com] which likely fits better.
Aaron Collins [yahoo.com], a mechanical engineer with a master's thesis on aerosols, has done his own aerosol testing with Powecom earloop masks and he did get over 97% efficiency [google.com] with the mask on his face.
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This is exactly the kind of mask that we all ought to be using. At this price, there's no reason to bother with makeshift cloth masks or so-called "surgical" masks, few of which have any sort of data to prove effectiveness.
When used for a median of 40 times with the longest time worn once donned being 2.5 hours, 83% still passed these tests.
For just filtration, not fit:
"We estimated the probability of N95s remaining effective at incremental N95 donnings and found that was >95% of N95 would maintain an adequate fit for up to 23 donnings and >90% for up to 31 donnings."
https://www.medrxiv.org/content/1...087v1.full
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This is exactly the kind of mask that we all ought to be using. At this price, there's no reason to bother with makeshift cloth masks or so-called "surgical" masks, few of which have any sort of data to prove effectiveness.
Our community has rated this post as helpful. If you agree, why not thank arslanaslamc
Our community has rated this post as helpful. If you agree, why not thank MrStealYourHamster
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When used for a median of 40 times with the longest time worn once donned being 2.5 hours, 83% still passed these tests.
For just filtration, not fit:
"We estimated the probability of N95s remaining effective at incremental N95 donnings and found that was >95% of N95 would maintain an adequate fit for up to 23 donnings and >90% for up to 31 donnings."
https://www.medrxiv.org/content/1...087v1.full
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