This is for me almost an academic question, but for others it might be important.
There appear to be two kinds of disease-prventing masks, that both look like "surgical masks", often blue on one side.
One kind is "medical" and the other kind is "non-medical". Based on some news articles, "medical" is pretty good. I've specifically read that it is better than cloth masks, any cloth mask afaict. Including afaict the ones you see politicians etc. wearing in public.
Surgical masks usually have two ear loops and they are pleated, so they get bigger vertically to cover nose and chin.
But afaict while they are labeled on the box, neither kind is labeled on the mask. I'm hoping I just haven't seen a medical mask in person and that they are actually labeled. I'm going by pictures on Amazon, and the pictures look pretty comprehensive, as they usually are, and even medical masks are not labeled as such.
They are both cheap, but I forget how much, maybe 37 cents each for medical and 30cents for non-medical, but I coudl be wrong. Not tonight but later I'll include some links, but I was hoping one of you knew the answrs without my providing links.
IIRC, even my KN95 masks don't have a spec written on the, although they were in high quality, thick "zip loc" style bags with a separate seal in addition. OTOH, my N95 masks were fully labeled by 3M with model number and some agency initials and "N95".
Without labeling, how can anyone prove that was sold didn't meet whatever standard there is, or that they were not sent what they ordered?