Available in several styles to fit the preferences of every individual. We offer full and short face shields, face shields with masks, with Tyvek™ expanders, even face shields that can be used with reusable frames. Our various face shields offer different types of protection and the same anti-fog, anti-glare performance you’ve come to expect. Bacterial Filtration Efficiency (BFE) is the effectiveness of a material to filter bacteria of a specified particle size, 3.0 µm (micron) ± µm. This expressed as a percentage of a quantity that does not pass through the material Particle Filtration Efficiency (PFE) is the effectiveness of a material to filter aerosol particles in the size range 0.1 µm to 5.0µm. This is expressed as a percentage of a quantity that does not pass through the material.