The Dutch National Institute for Public Health and the Environment (RIVM) has conducted a pilot study and found a reprocessing method that leads to an acceptable quality of reprocessed face masks. The caveat is that only limited research has been done on the retention of particles by reprocessed face masks. This study shows that FFP2 face masks retained their shape and were able to retain particles in a ‘quick’ test after sterilizing once and twice with a short hydrogen peroxide process. In times of scarcity, FFP2 masks can be used three times when sterilized twice with hydrogen peroxide in between use. This note was discussed in the outbreak management team (OMT). The OMT endorses the usefulness of this application if urgent shortages arise.
Amendment after discussion in OMT on March 18, 2020: The point regarding surgical masks and protection against corona virus was removed.
Here you can find an up-to-date overview (in Dutch) of reprocessing methods for reuse of surgical masks