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Fabtech manufactures & designs the customized containment enclosures that follow cGMP practices & complies with respective ISO standards for leak tightness respectively.
The classification of containment enclosures according to their hourly leak rate, Tf , is given in table below.
The leak rate is measured at the normal operating pressure (usually about 250pa) for checking during operational use, and 1000 Pa for the acceptance test
 Classification of Containment Enclosure According to Their Hourly Leak Rate. |
| * The classification of leak tightness required for a particular application under classes 1 & 2 shall be decided by the designer & user & licensing authorities. Normally, Class 1 will be applied for technical reasons when higher gas purity is required |
| Class |
| Hourly leak rate, |
| Class Tf ,h-1 |
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Example |
| 1* |
≤ 5 x 10-4 |
Containment enclosure with controlled atmosphere under inert gas conditions. |
| 2* |
≤ 2,5 x 10ˉ³ |
Containment enclosure with controlled atmosphere under inert gas conditions or with permanently hazardous atmosphere. |
| 3 |
≤10ˉ² |
Containment enclosure with permanently hazardous atmosphere. |
| 4 |
≤10ˉ¹ |
Containment enclosure with controlled atmosphere which could be hazardous. |
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