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Table 3 Comparison of the filtration performance of masks made of different materials [16]

From: Addressing the worldwide shortages of face masks

Sample

Flow rate: 1.2 CFM

Filter efficiency (%)

Pressure differential

< 300 nm average ± error

> 300 nm average ± error

ΔP (Pa)

N 95

85 ± 15

99.9 ± 0.1

2.2

Surgical mask

76 ± 22

99.6 ± 0.1

2.2

Cotton quilt

96 ± 2

96.1 ± 0.3

2.7

Quilter’s cotton (80TPI), 1 layer

9 ± 13

14 ± 1

2.2

Quilter’s cotton (80TPI), 2 layers

38 ± 11

49 ± 3

2.5

flannel

57 ± 8

44 ± 2

2.2

Cotton (600TPI), 1 layer

79 ± 23

98.4 ± 0.2

2.5

Cotton (600TPI), 2 layers

82 ± 19

99.5 ± 0.1

2.5

Chiffon, 1 layer

67 ± 16

73 ± 2

2.7

Chiffon, 2 layers

83 ± 9

90 ± 1

3.0

Natural silk, 1 layer

54 ± 8

56 ± 2

2.5

Natural silk, 2 layers

65 ± 10

65 ± 2

2.7

Natural silk, 4 layers

86 ± 5

88 ± 1

2.7

Cotton/chiffon

97 ± 2

99.2 ± 0.2

3.0

Cotton/silk

94 ± 2

98.5 ± 0.2

3.0

Cotton/flannel

95 ± 2

96 ± 1

3.0

  1. TPI = Threads per inch
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BMC Materials

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