What is the ASTM criteria for a Level 3 medical mask rating?
|Bacterial filtration efficiency, %||≥ 98|
|Sub-micron particulates filtration efficiency at 0.1 micron, %||≥ 98|
|Differential pressure, mm H2O/cm2 (Breathability)||< 5.0|
|Resistance to penetration by synthetic blood, minimum pressure in mm Hg for pass result||160|
|Helmke Drum||Category 2|