TABLE 1.
Characteristics of various facial masks used in the study
| No. | Type | Color | Numberof layers | Material(s) | Company | Weight (g) per unit area (3 × 3 cm) |
|---|---|---|---|---|---|---|
| 1 | Surgical | Black | 3 | PolypropelenePolyethylene | a | 0.12 |
| 2 | KF94 | Black | 4 | PolypropelenePolyethylene | a | 0.19 |
| 3 | 3 | Polypropelene | b | 0.13 | ||
| 4 | KF94 | White | 4 | PolypropelenePolyethylene | a | 0.14 |
| 5 | 3 | PolypropelenePolyethylene | b | 0.13 | ||
| 6 | 3 | Polypropelene | c | 0.10 | ||
| 7 | KF‐AD | White | 3 | Polypropelene | d | 0.08 |
| 8 | KF80 | White | 3 | PolypropelenePolyethylene | a | 0.08 |
| 9 | 2 | Polypropelene | c | 0.10 | ||
| 10 | Surgical | White | 3 | Polypropelene | e | 0.05 |
| 11 | Reusable | White | 3 | Micro‐nanofiber(Polyester) | f | 0.19 |
| 12 | Translucent | 3 | Micro‐nanofiber(Polyester) | f | 0.09 |