Standard: YY/T0969-2013, EN14683:2014. Fluid Resistant. BFE ≥98% – this mask has 98% bacterial filtration efficiency for maximum protection.
Bacterial Filtration Efficiency (BFE) is the effectiveness of a material to filter bacteria of a specified particle size, 3.0 µm (micron) ± µm. This is expressed as a percentage of a quantity that does not pass through the material.
Usage time max 4 hours.