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. 2022 Jan 5;17(1):e0257963. doi: 10.1371/journal.pone.0257963

Fig 3. SEM characterizations of three layers in 3M 1860 N95 FFR.

Fig 3

(a-b) SEM/EDS images of cross section. (c-e) SEM images of top-down view of untreated 3M 1860 N95. (f-h) SEM images of top-down view of the of 3M 1860 N95 after dry heat treatment at 100°C for 4 cycles. (i-k) SEM images of top-down view of the of 3M 1860 N95 after autoclaving treatment.