Requirement per ASTM F2100:2011Sample Size (Facial mask)Bacterial Filtration Efficiency (BFE)Adopting ASTM F2101: 2014≥95% for Level 1≥98% for Level 2≥98% for Level 310 pcsVirus Filtration Efficiency (VFE)Adopting ASTM F2101:2014 (Modified)Result only15 pcsParticle Filtration Efficiency (PFE)Adopting ASTM F2299: 2003(2017)≥95% for Level 1≥98% for Level 2≥98% for Level 310 pcsSynthetic Blood Penetration Resistance for filter maskAdopting ASTM F 1862 : 2000aNo penetration in pressure (mm Hg)≥80 for Level 1≥120 for Level 2≥160 for Level 335 pcsDifferential Pressure TestAdopting MIL-M-36954C 4.4.1.