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Filtration Efficiency for Each Class of Masks
| Test | FFP1 | FFP2 | FFP3 |
|---|---|---|---|
| Concentration of harmful substances | Till 4 × NDS | Till 10 × NDS | Till 30 × NDS |
| Leakage | <22% | <8% | <2% |
| Penetration | <20% | <6% | <1% |
| Initial expiration resistance at 95 L/min | <210 Pa | <240 Pa | <300 Pa |
Abbreviations: FFP1, filtering face piece 1; FFP2, filtering face piece 2; FFP3, filtering face piece 3; NDS, the highest acceptable concentration of the harmful factor.
