ASTM Level 1

ASTM Level 2

ASTM Level 3

LSP Surgical Masks

Bacterial Filtration Efficiency (BFE)(%)

≥95

≥98

≥98

≥98.7

Particle Filtration Efficiency (PFE)(%)@0.1u

≥95

≥98

≥98

≥98

Delta P differential Pressure ^P (mm H2O/cm2)

<4.0 mm H20

<5.0 mm H20

<5.0 mm H20

1.8 mm 

Fluid resistance (mm Hg)

80 mm hg

120 mm hg

160 mm hg

<160 mm hg

Flammability

 1 min

1 min

1 min

Did not ignited at all