Filter testing results of 15 respirators (three each of one to four autoclave cycles and three new respirators)
| Number of autoclave cycles | Number of respirators tested | Mean (range) filtration efficiency of 0.3 µm particles at 55 L/min | Mean (range) filtration efficiency 0.1 µm particles at 30 L/min | Mean (range) of differential pressure at 55 L/min |
| 0 | 3 | 99.66 (99.20–99.99) | 99.92 (99.80–99.98) | 52.13 (51.50–52.80) |
| 1 | 3 | 99.26 (97.90–99.97) | 99.72 (99.30–99.94) | 60.03 (57.70–62.80) |
| 2 | 3 | 99.23 (99.20–99.30) | 98.60 (98.20–99.00) | 55.90 (52.80–60.50) |
| 3 | 3 | 99.13 (98.00–99.80) | 98.40 (97.40–99.69) | 58.90 (56.50–60.50) |
| 4 | 3 | 99.27 (98.85–99.75) | 98.96 (98.60–99.69) | 55.57 (53.70–57.10) |