The European safety standard EN 149 provides for two types of FFP respirators: FFP masks labelled "NR" (non reusable) are intended for single use for an 8-hour shift. FFP masks labelled "R" (reusable) can be reused. They have a sealing lip that can be cleaned and disinfected. Important: When handling radioactive and airborne biological agents (including the Coronavirus SARS-CoV-2), FFP respiratory masks may only be used once or for a maximum of one work shift, irrespective of the labelling.