Table 1.
Different types of masks selected in our study.
| Code | Characteristics | Origin | Recommended use | Weight (g)* | Price (€) | Photography |
|---|---|---|---|---|---|---|
| Surgical masks | ||||||
| M1 | Non woven Polypropylene | China (Ningbo Beilai Travelling Products Co. Ltd, Gaoyou Yongye Commodity Factory, Beifa Group Co. Ltd, etc.) | 4 h | 2.429 | 0.62a |  |
| M2 | 2.604 | |||||
| M13 | 2.526 | |||||
| M14 | 2.414 | |||||
| M19 | 2.748 | |||||
| M20 | 2.442 | |||||
| M21 | 2.661 | |||||
| M22 | 2.527 | |||||
| Self-filtering masks – KN95 | ||||||
| M3 | Non woven fabric | China (Taizhou Yongli Medical Device Co. Ltd, etc.) | 8 h | 3.581 | 2.35 |  |
| M6 | 4.952 | 1.40 | ||||
| M11 | 3.501 | 2.79 | ||||
| Self-filtering masks - FFP2 | ||||||
| M16 | Spun bond polypropylene | Germany, Spain (Bioinicia-CSIC) |
2 full days | 3.260 | 2.40 |  |
| M18 | 3.293 | |||||
| M17 | not provided | not provided | 8 h | 8.298 | – | |
| Self-filtering masks - FFP3 | ||||||
| M5 | not provided | Spain (Irudek) | 8 h | 10.645 | 9.95 |  |
| M10 | Polypropylene | Spain (3 M) | 7.707 | 7.75 | ||
| Filters for homemade masks | ||||||
| F1b | Activated carbon, non woven filter cloth | not provided | 1 day | 1.527 | 1.50 |  |
| F3 | Non woven Polypropylene | not provided | 4 h Re-usable (x9) |
0.979 | 0.60 | |
| Reusable masks | ||||||
| M4 | Ecological cotton | not provided | 1 day Re-usable (x40) |
6.404 | – |  |
| M7 | PET | Spain | 8 h Re-usable (x20) |
7.238 | 15 | |
| M8 | Recycled PET | 7.321 | ||||
| M12 | Polyamide | Spain (Quretex) | 1 day Re-usable (x70) |
6.955 | 7 | |
*
Weight of the mask without rubber bands and nose clip, and for M5 and M17, also without valve.
a
Maximum price established by the Spanish government.
b
For an optimal filtration, the application of 2 filters was recommended for each use.