Caution, caution before you buy imported respirators. The NPPTL to the rescue! They are the testing body that test our domestic supply of respirators and since their job is testing N95 respirators, they decided to test the imports to see how they stacked up. In summary? Not very well. First, many of them use ear straps, which are much less effective than the normal rubber two head strap configuration. It must be noted that 62.8% of the KN95s tested by NPPTL FAILED to meet N95 filtration standards. Of the 87 KN95 manufacturers listed on the FDA Emergency Use Authorization (Updated April 24, 2020), only 12 are found on the NPPTL test list, and only 25% PASSED N95 filtration criteria. A very poor showing. If you want to see the full article with the charts, click here.