Thanks for the response. I understand your reasoning for failing the KN95s, but then what about the Lutema mask, which uses a proprietary standard? Lutema includes some lab test documents [0] but I can't find any technical information about what results exactly is required to qualify as an "M series" mask. They mostly seem to compare with with KN95 masks, but without really saying what makes them different [1] (note that the testing info on that page are for their surgical mask).
It seems like the "M series" designation is mostly a branding effort to make their masks stand out from the competition, and less about specific technical improvements.
I did look to see if you had a video on this mask but there doesn't seem to be one, would love to hear your take on this unusual designation.
And regarding the Boncare (et al) masks, I suspect the omission is at least partially motivated by style; it makes the mask less conspicuous for mainstream use. The labeling on most (passing) masks tends to be rather obtrusive.
0: https://lutema.com/collections/made-in-usa-masks/products/ad...