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When sterilizing face masks, the type of face mask and the method of sterilization affect filtration efficiency, suggests new research. The greatest reduction in filtration efficiency post sterilization was found in surgical face masks.
Using plasma vapor hydrogen peroxide (H2O2) sterilization, filtration efficiency of N95 and KN95 masks was maintained at >95%; however, for surgical face masks, it was reduced to <95%. When sterilized with chlorine dioxide (ClO2), filtration efficiency was maintained at >95% for N95 masks. For KN95 and surgical face masks; however, it was reduced to <80%. The findings were published online June 15 in JAMA Network Open… (Medscape)