50 Pack of Christmas Themed Adult and Children Disposable ...
Dec 11, 2020·So, if you choose to step down from the more effective respirator (N95/KN95/KN94), the next best thing is to use a REAL surgical mask and the easiest way to identify a real surgical mask is the ASTM certification. ASTM is an industry based certification that's widely regarded as effective and ensures some level of 3rd party testing.