Glossary of Mask Terms

PFE: Particle Filtration Efficiency: Measures the percent efficiency at which the facemask filters sub micron particulate from passing through the mask.

Fluid Resistance: The ability of a face mask material construction to minimize fluids such as blood, body fluids and aerosols from traveling through the material and potentially come into contact with the user. The only test standard fluid resistance is the ASTM F 1862. All masks designated “fluid resistant” meet or exceed ASTM F1862 for fluid resistance at 80, 120 or 160.  The higher the number the better the fluid resistance.

Breathability – Differential Pressure : Conveys how easily air passes through a facemask which is an indication of how easily you can breathe while wearing it.  The lower the , the easier the mask is to breathe through.