. Author manuscript; available in PMC: 2024 Dec 30.

Published in final edited form as: ACS ES T Eng. 2024 Jan 4;4(2):401–408. doi: 10.1021/acsestengg.3c00365

Table 1.

Properties of the ASTM Level 3 Face Mask and the CV Layer

parameter	face mask	CV
areal density (g/m²)	85.0 ± 2.67^b	16.95^a
thickness (mm)	0.282 ± 0.0183^b	0.127^a
material	polypropylene	polyacrylonitrile (PAN) carbon fiber and polyester binder^a
bacterial filtration efficiency (%)	>98^a	not available
particle filtration efficiency (%)	>98^a	not available
breathability (Pa/cm²)	<49^a	0.1 ± 0.03^b
manufacturer	Vaxxen Laboratories, USA	ACP composites, USA

Details provided by the manufacturers.

To determine actual thickness for face masks, measurements were taken using an electronic outside micrometer (Schut Geometrical Metrology).