Table 4 Summary of face mask materials.
From: Microstructure analysis and image-based modelling of face masks for COVID-19 virus protection
Materials | Structure | Notes | |
|---|---|---|---|
Reusable FM | polyester, cotton and elastane | Single layer | N/A |
Surgical FM | polypropylene (PP) | Three layers | middle layer (melt-blown filter), and a water-resistant outer layer (nonwoven fibres coloured in blue) |
N95 FM | polypropylene (PP), metal | Three or four layers | electrostatic charge the middle layer |
