11–20 of 250 posts
This problem could be far easier solved by... minimum airflow requirements.... or just stepping outside. Even in the Covid hotspot of wuhan, there are only a handful of outdoor transmission cases.
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 a true resource for people.
Disclaimer: Yes, I'm a mask manufacturer and that's how I justify keeping all of this equipment up to spec, but I'm not big enough to make all of the masks for the world so I'd rather people find a good mask than just use my mask.
Any feedback is appreciated.
Small 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…
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 the standard?
KN95, N95, KF94, Surgical, FFP2 and others all have hundreds of pages of standards that they have to meet. Most people don't know what these are but we make masks so I've read all of the standards.
Most masks or respirators fail in #3 and we are working on being specific as to why those are failing but we have about 400 masks posted and the notations are being transposed as I write.
How does one verify whether the product on Amazon is legitimate? Most masks have reviews referring to comingled fakes, and it's put me off buying.
IMO Amazon is convenient, but this is your health and it's worth an extra step.
How does one verify whether the product on Amazon is legitimate? Most masks have reviews referring to comingled fakes, and it's put me off buying.
This guy on youtube contacted the US Nuclear Regulatory Commission to force Amazon to delist these products with excessive negative-ion radiation: https://www.youtube.com/watch?v=3BA5bw1EV5I
I'm a bit confused by the listed results. For example one mask is listed a KN95 and has a fail although filtering is stated as 99.87%. Isn't a KN95 specifically rated to hold at least 95% of particles of a certain size? Anything above is irrelevant as it holds up to the minimum requirement? Or is it 99.87% of 95% which I would still consider within margins of manufacturing variations. A KN95 that filtered only 75% is…
How they rate masks as passing and failing is not transparent. They indicate they rate the masks on construction and smell but do not give the scores.
Anyone have a scatter plot of resistance vs filter efficiency? Watching each review would take forever. I want to explore the results visually.
Consider adding (affiliate) links to ones that did well, ordered by availability or price. Why Amazon doesn’t do this is beyond me.
If you click on a mask it will take you to a page with the test details. More incredibly, most of the masks also have 5-7 minute video review!
If you click on the "Breathability" column, then on "Grade" twice, you will end up with a list of masks that Pass with the most breathable masks first.
Way to go, Lloyd. I've never heard of you or your company before, but I am genuinely impressed.
I'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…