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. 2020 May 26;3(5):e209961. doi: 10.1001/jamanetworkopen.2020.9961

Table. Single-Pass Filtration Efficiencies for Ambient Particles of Irradiated N95 Masks .

Mask model and dosea Single-pass filtration efficiency, mean (SD), % Air pressure differential, Pa Air flow velocity, m/s Temperature, °C RH, %
0.3 μm 0.5 μm 1 μm
9105, 0 kGy
Mask 1 85.9 (3.9) 89.5 (4.5) 94.3 (4.1) 175.5 0.4 23.7 11.5
Mask 2 88.3 (3.5) 90.2 (3.6) 94.7 (3.6) 185.8 0.4 23.9 19.5
1805, 1 kGy
Mask 1 29.2 (1.4) 41.1 (1.4) 70.3 (8.2) 186.1 0.1 23.9 20.4
Mask 2 31.1 (1.8) 43.0 (4.4) 72.1 (10.6) 186.6 0.1 23.8 20.6
9105, 10 kGy
Mask 1 28.3 (1.1) 38.6 (2.5) 74.3 (8.1) 176.8 0.4 23.2 12.1
Mask 2 22.2 (1.1) 35.5 (3.2) 63.1 (11.1) 186.0 0.4 23.9 20.4
9105, 50 kGy
Mask 1 24.8 (1.0) 36.7 (2.7) 69.5 (11.4) 176.8 0.4 23.1 12.4
Mask 2 23.8 (0.8) 35.1 (1.9) 72.0 (12.2) 184.2 0.4 23.9 20.2
8210, 0 kGy
Mask 1 88.1 (1.9) 91.4 (1.8) 89.2 (2.7) 173.9 0.4 22.9 11.3
Mask 2 85.0 (2.2) 85.4 (1.7) 86.2 (3.5) 191.7 0.4 23.6 21.1
8210, 1 kGy
Mask 1 30.8 (0.8) 43.1 (3.7) 75.0 (9.5) 185.0 0.4 23.7 21.2
Mask 2 26.2 (1.4) 37.4 (2.0) 61.6 (10.7) 187.1 0.4 23.7 21.4
8210, 10 kGy
Mask 1 35.2 (0.9) 45.0 (2.8) 81.0 (5.7) 179.2 0.4 23.1 11.7
Mask 2 23.3 (1.6) 34.3 (2.5) 56.3 (13.0) 185.5 0.4 23.7 21.4
8210, 50 kGy
Mask 1 28.2 (1.1) 36.0 (2.3) 66.0 (9.9) 186.1 0.4 23.6 21.4
Mask 2 29.6 (1.0) 45.2 (2.1) 71.9 (9.2) 186.4 0.4 23.7 21.2

Abbreviation: RH, relative humidity.

a

All masks were manufactured by 3M.