Description
Ahlstrom-Munksjö® Qualitative Filter Paper, Grade 642, 4.25 cm, 2.0 micron, 100/PK, 6420-0425
Features:
- 2 μm, Medium Speed
- Has finer particle retention than Grade 601 but with slightly lower filtration speed
- Higher absorption than Grade 601
- Used in general laboratory applications to retain particles above 2 μm in size
- Also found in agricultural and environmental laboratories for plant growth trials, soil testing, and air analysis for monitoring specific contaminants and in filtration of organic and sulfide precipitates.
- Non wet-strengthened
- Suitable for quadrant folded or gravity flow applications
Specifications:
| Class | Qualitative |
| Speed | Medium |
| Grade | 642 |
| Size | 4.25 cm diameter |
| Retention | 2.0 µm |
| Filtration Speed Herzberg | 229 seconds/100 mL |
| Filtration Speed Rapidity | 30 mL/minute |
| Loading Capacity | Medium |
| Equivilent Grade | Whatman Grade 2 |
| Material | > 95% super refined α-cellulose and linter fibers |
Specifications
| Range | Particle retention: 2 micron |
|---|---|
| Range | Filtration speed (Herzberg): 229 sec/100 mL |
| Range | Flow Rate: 30 mL/min |
| Range | Weight: 95 g/sq m |
| Material | Cotton fiber alpha-cellulose |
| Other | Surface texture: smooth |
| Other | Ash content: 0.06% |
| Dimensions | 4.25 cm diameter, thickness: 0.2 mm |
| Manufacturer | Ahlstrom |
| Model No | 6420-0425 |