Table 4.5.
IEST-RP-CC001.4-2005
| Test with photometer (test aerosol with mass median diameter 0.3 μm and count median diameter <0.2 μm) | Filtration efficiency | Leakage detection | Test with particle counting method (0.1–0.2/0.2–0.3 μm) |
|---|---|---|---|
| Grade A | ≥99.97 % | Leakage detection not needed | Grade H |
| Grade B | Test efficiency with two flowrates | Grade I | |
| Grade E | Test efficiency with two flowrates for nuclear application | ||
| Grade C | ≥99.99 % | Leakage detection needed | Grade J |
| ≥99.995 % | Leakage detection needed | Grade K | |
| Grade D | ≥99.999 % | Leakage detection needed | Grade F |
| ≥99.9999 % | Leakage detection needed | Grade G (MPPS efficiency) |