Product Description A fluid-resistant, flat, earloop face mask for general patient care applications. Hypo-allergenic to reduce chances of wearer's allergic reaction and featuring a non-fiberglass construction. The 3M 1820 has a 99% Bacterial Efficiency Efficiency (BFE), a >91% 0.1 micron filter efficiency and fluid resistant to help reduce potential exposure of the wearer to blood and body fluids.