The filtration efficiency of respirator masks (FFP masks) depends on the safety classification. A distinction is made between three quality classes: FFP1 masks filter at least 80%, FFP2 masks at least 94% and FFP3 masks at least 99% of a test aerosol. The World Health Organization (WHO) and the Robert Koch Institute recommend at least class 2 for the medical field. Our masks are FFP2 masks. However, they achieve a filtration efficiency of 95% (compared to many masks from other manufacturers which have a filtration efficiency of only 94%), because they are tested to EU standards (CE certified). Before putting on a mask, clean your hands thoroughly with soap and water or a suitable hand sanitiser. Follow the instructions when putting the mask on: Adjust it to fully cover your mouth and nose, with no gaps between your face and the mask.