Face Masks in the New COVID-19 Normal: Materials,
The 3-ply surgical mask is commonly used in the COVID-19 pandemic. The 3-ply surgical mask is made up of 3 different layers of nonwoven fabric with each layer having a specific function, as shown in Figure 3. The outermost layer (typically blue) is waterproof and helps to repel fluids such as mucosalivary droplets.
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