A few things. The PFE test I'm doing is a 2min test and doesn't tell you what the mask will do under load (all day use). It's really a simple way to tell if the mask sucks but not if the mask is good (if that makes sense).
If someone doesn't label the mask correctly...are they even reading the standard?
The gb2626-2019 standard is 57 pages and in it you have to do a lot of very technical testing. One test requires several days of testing in a lab and is very expensive, but it's designed to make sure the mask performs under actual use (called the loading test).
If the manufacture isn't willing to put some simple words on a mask, do you think they did this complicated several-day test? Probably not.
IMO it's the brown M&M or canary in the coal mine test.
If someone doesn't label the mask correctly...are they even reading the standard?
The gb2626-2019 standard is 57 pages and in it you have to do a lot of very technical testing. One test requires several days of testing in a lab and is very expensive, but it's designed to make sure the mask performs under actual use (called the loading test).
If the manufacture isn't willing to put some simple words on a mask, do you think they did this complicated several-day test? Probably not.
IMO it's the brown M&M or canary in the coal mine test.