Table 2.

Discernible observations caused by FFR decontamination treatments

Decontamination treatment	Discernible observations
Bleach	Metallic nosebands were slightly tarnished and visibly not as shiny when compared with their as-received counterparts. SN95-E inner nose comfort cushion was discolored. Following air-drying overnight (16 h), all FFRs were dry to the touch and all still had a characteristic smell of bleach.
UVGI	No visible changes were observed for all samples.
EtO	No visible changes were observed for all samples.
VHP	Metallic nosebands were slightly tarnished and visibly not as shiny when compared with their as-received counterparts.
Microwave oven irradiation	All three physical samples of two different models (SN95-E and P100-I) melted partially. SN95-E filtration material melted in areas adjacent to the metallic nosebands. P100-I melted in various locations of the inner foam faceseal comfort lining. Both models were considered unwearable following treatment and subsequently were not evaluated for filter aerosol penetration or filter airflow resistance.