Correlation of He-Leak Values to Risk of Microbial Failure per Kirsch et al.a
| Hole Diameter (µ) | He-Leak (cm3/s @ STP) | −log (He-Leak) | Microbial Ingress Rate (%) |
|---|---|---|---|
| 2 | 1.0 × 10–3 | 3.0 | 70 |
| 0.7 | 2.0 × 10–4 | 3.7 | 65 |
| 0.4 | 9.0 × 10–6 | 5.0 | 11 |
| --- | 6 × 10–6 | 5.2 | 8–10 |
| 0.3 | 2.0 × 10–6 | 5.7 | 7 |
| 0.2 | 2.2 × 10–7 | 6.6 | 0 |
| 0.1 | 1.0 × 10–7 | 7.0 | 0 |
↵a This table is a reproduction based upon data reported. A value of 6 × 10–6 cm3/s–corresponding to a microbial ingress rate <10%–was considered acceptable.