| Characteristic | Level 1 |
| Bacterial filtration efficiency | ≥95% |
| Sub-micron particulates filtration efficient at 0.1 micron | ≥95% |
| Differential pressure, mm H20/cm2 (Breathability) | <4.0 |
| Resistance to penetration by synthetic blood, minimum pressure in mm Hg for pass results | 80 mm Hg |
| Flame spread | Class 1 |
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