I've been buying masks from Armbrust since early in the pandemic. I didn't trust anything on Amazon, and I wanted something made in the US, on the theory that the high-quality stuff made in China would be less likely to be exported.
Show HN: I bought and tested the filtration of every mask on Amazon
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Re: Show HN: I bought and tested the filtration of every mask on Amazon
#52[deleted]
Re: Show HN: I bought and tested the filtration of every mask on Amazon
#53Small note on the methodology link: I thought it was a 404 dead link because when I opened it in a new tab it was a 404 (turns out it's a pop-up modal). I don't think what's described in the methodology actually lines up with the result pages. In particular the methodology pop-up has sections about construction and smell, but I don't think I see them anywhere in the text of a particular mask review, i.e. it doesn't l…
Thanks for noting, this was our old methodology and I will get that updated ASAP. We are now removing the subjective feedback and only talking objectively: 1) Does the mask pass the claimed PFE (particulate filtration efficiency) standard that it claims to pass? 2) Does the mask pass the claimed breathability (as stated in the standard they are claiming, ie N95, KN95, surgical)? 3) Does the mask meet other parts of t…
With regards to #3, I found it a bit incongruous that you failed some KN95 masks (like Boncare) for incomplete labeling, while allowing a mask to pass that met a standard that appears to be entirely of their own devising (the Lutema M95i [0]). This seems to be a bit unfair, given that they both performed well in the PFE and breathability tests. It seems like if Boncare decided to call theirs an “MN95” mask, it would have passed too.
Re: Show HN: I bought and tested the filtration of every mask on Amazon
#54That's a real trove of information! I see there are no cloth masks tested. I'd love to know how useful they are (or can be) as I much prefer being able to reuse my masks. Edit: just realised that both Type and Style can be cloth and the cloth ones are presumably all under Style. All of them failed :(
you can reuse n95s, nurses do it all the time. let them sit near a sunny window, off-smells will dissipate in a day. each mask is good for around 8 hours of continuous usage, but it's likely that the mask becomes too soiled before the electrostatic charge is neutralized.
Re: Show HN: I bought and tested the filtration of every mask on Amazon
#55I've spent about 1,000 hours on this with my team using a very expensive (~$250k) lab and I'd love for this to be a great resource for people when choosing a mask. The heavy lift we are doing here is around our particulate filtration efficiency test in which we do either the NIOSH N95 NaCL (0.3 micron) test or the ASTM 0.1 micron latex particle test. I'd love HN feedback on how we improve the interface and make this…
Your filtration test appears to be only testing the mask fabric, but not the fit.
I see a number of surgical masks over 95%. I don't think that would be possible in practice, because of leaks at the sides and top. I'd expect more like 50%. But, you don't appear to have the equipment to do a fit test.
Refer to the 3M video on how to fit test an N95.
I realize that N95 and surgical masks have different standards, but you are making them look comparable, when they are not.
Re: Show HN: I bought and tested the filtration of every mask on Amazon
#56Earlier quoted context omitted.
these don't have filtered output, do they?
No, but if everyone is wearing one it doesn't matter. Some of the masks on this site are vented as well.
Most of the point of wearing a mask is to prevent you from unknowingly spreading COVID to other people. Many stores I visit have signs prohibiting vented masks.
Re: Show HN: I bought and tested the filtration of every mask on Amazon
#57Project N95 is the National Critical Equipment Clearinghouse for personal protective equipment (PPE), COVID-19 diagnostic tests and critical equipment. Edit: stupid typo on url, sorry https://www.projectn95.org/ US based non profit, not tied to amazon. I've bought their stuff. They are legit.
I guess they just got slammed with orders?
It would be much nicer if they showed 'SOLD OUT' on anything not in stock rather than nothing. (Firefox, Linux, even on my 'no plugins' profile and after creating an account.) It just shows reviews and nothing else on any masks page.
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They aren't depending on Facebook for antifruad are they? How will they ever sell to someone security minded like me that refuses to ever sign up there?
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Re: Show HN: I bought and tested the filtration of every mask on Amazon
#58No post body was provided.
Re: Show HN: I bought and tested the filtration of every mask on Amazon
#59I've been buying masks from Armbrust since early in the pandemic. I didn't trust anything on Amazon, and I wanted something made in the US, on the theory that the high-quality stuff made in China would be less likely to be exported.
Moldex is made in US and the mesh support requires more work to counterfeit.
Re: Show HN: I bought and tested the filtration of every mask on Amazon
#60Earlier quoted context omitted.
No, but if everyone is wearing one it doesn't matter. Some of the masks on this site are vented as well.
Most of the point of wearing a mask is to prevent you from unknowingly spreading COVID to other people. Many stores I visit have signs prohibiting vented masks.
I'm pretty sure a vented mask is at least as effective as a cloth or surgical mask in that regard, both of which mostly contain the aerosol spray rather than actually filter out small particles. I doubt the stores you go to require true respirators?
Apparently the CDC agrees: https://www.cdc.gov/coronavirus/2019-ncov/hcp/respirator-use...
> Yes, an N95 filtering facepiece respirator will protect you and provide source control to protect others. A NIOSH-approved N95 filtering facepiece respirator with an exhalation valve offers the same protection to the wearer as one that does not have a valve. As source control, findings from NIOSH research suggest that, even without covering the valve, N95 respirators with exhalation valves provide the same or better source control than surgical masks, procedure masks, cloth masks, or fabric coverings.