Filter Supports
Various materials are used to support filters during sampling.
- Cellulose supports feature a smooth surface and uniform air flow distribution
- Porous plastic pads are impervious to most solvents
- Use stainless steel screens when cellulose or plastic will interfere with analysis
| Diameter (mm) | Support Material | Pack Size | Part Number | |
| 25 | Cellulose pad | 100 | 225-28 |  |
| 25 | Stainless steel screen, wide mesh | Each | 225-2625 |  |
| 25 | Polyethylene (porous plastic) | 100 | 225-2901 |  |
| 37 | Cellulose pad | 100 500 |
225-27 225-2700 |
 |
| 37 | Cellulose spacer ring (NIOSH 5506 and 5515) | 25 | 225-23 |  |
| 37 | Polyethylene (porous plastic) | 100 | 225-2902 |  |
| 37 | Stainless steel screen, wide mesh | Each | 225-26 | |
| 37 | Stainless steel screen, fine mesh | Each | 225-2637 |  |
| 47 | Cellulose pad | 100 | 225-2903 |  |
| 47 | Stainless steel screen, wide mesh | 2 | 225-2647 | |
| 47 | Stainless steel screen, fine mesh | Each | 225-2647A | |
