Filterpaper Whatman +ash diam.90mm grade 50
QD1450090
| Product number: | QD1450090 |
|---|---|
| Diameter: | 90 mm |
Cellulose filters made from high quality cotton. The filters are used in qualitative analysis techniques to determine and identify substances. Some grades are reinforced with a stable resin, making them resistant to moisture.Hardened low ash:
- Treatment with strong acids to improve chemical resistance and strength after wetting.
- Smooth and strong surface for the recovery of the precipitates.
- 0,015% ash maximum.
- Treatment with acids for improved strength after wetting in combination with a very low ash residue.
- Smooth and strong surface for a large variety of manipulations.
- 0,006% ash maximum.
Grade |
Filtration rate / aspect |
Retention (µm) |
Thickness (µm) |
Weight (g/m²) |
50 |
slow |
2,7 |
115 |
97 |
52 |
average |
7 |
175 |
101 |
54 |
very fast |
20-25 |
185 |
92 |
540 |
average |
8 |
160 |
88 |
541 |
fast |
20-25 |
155 |
82 |
542 |
slow |
2,7 |
150 |
93 |