COVID-19: Proper Use, Reuse And Disposal Of Masks ...
N95 respirator: When reusing the N95 respirator, leave a used mask in the dry atmosphere for 3-4 days to dry it out. As the polypropylene in N95 is hydrophobic and contains zero moisture, the coronavirus which needs a host to survive will not able to survive, if the respirator is dry for 3-4 hours.