Pall uses a double layer construction for sterilizing grade filter for combining highest removal safety with optimum economics. Pall produces a range of sterilizing grade filter for use in liquids and gases, covering a wide range of target applications. The various filter designs address the respective application requirements and ensure optimum suitability for the target application.
Pall has historically used a double layer construction for sterilizing grade filters, where the two layers consist of 0.2µm rated membranes of the same type. This construction is well suited for final formulation and filling applications and critical gas filtration applications. Examples for this construction are filters of the following type:
| Ultipor® N66 grade NR (0.2 µm) | hydrophilic - liquid service |
| Ultipor N66 grade NF (0.2 µm) | hydrophilic - liquid service |
| Ultipor N66 grade NT (0.1 µm) | hydrophilic - liquid service |
| Posidyne® grade NFZ (0.2 µm) | hydrophilic - liquid service |
| Posidyne grade NTZ (0.1 µm) | hydrophilic - liquid service |
| Fluorodyne® grade DFL (0.2 µm) | hydrophilic - liquid service |
| Emflon® II grade V002 (0.2 µm) | hydrophobic - typically gas service |
| Emflon grade PFR (0.2 µm) | hydrophobic - typically gas service |
Other filters feature a construction of two membrane layers, where the upstream membrane layer has a different pore rating from the downstream layer, depending on the respective target application. This construction is well suited for the filtration of difficult-to-filter fluids or challenging contamination control tasks. Examples for this construction are filters of the following types:
| Fluorodyne grade DJL (0.1 µm) | hydrophilic - liquid service |
| Fluorodyne EX grade EDF (0.2 µm) | hydrophilic - liquid service |
| Fluorodyne EX grade EDT (0.1 µm) | hydrophilic - liquid service |
| Supor® grade EBV (0.2 µm) | hydrophilic - liquid service |
| Supor grade EKV (0.2 µm) | hydrophilic - liquid service |
| Supor grade ECV (0.2 µm) | hydrophilic - liquid service |