Whatman Filter Paper
What is it used for?
Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs. These include thickness, retention, and weight. Below is a list of filter paper we have on offer, however we have an extensive range available. Please contact our customer service team via phone, email or chat and they can help you with a product to suit your requirements
The Whatman quantitative filter paper range offers the user a high level of performance with many benefits. The papers have a smooth surface which provides excellent flow rates and loading capacity. In addition, they offer good retention of particles and low levels of extractables. This results in cleaner analysis with less chance of contamination. The papers are also easy to use with a wide range of equipment.
Qualitative Grades – Circles
|
Grade |
Flow Rate | Retention Microns | Wet Strength | Thickness mm | Ash % | |
| 1 | The most widely used general purpose paper | Medium/Fast | 11 | L | 0.18 |
0.06 |
|
2 |
Slightly thicker and more retentive than No1 | Medium/Fast | 8 | L | 0.19 | 0.06 |
| 3 | Double the thickness of No.1 | Medium | 6 | M | 0.39 |
0.06 |
| 4 | Excellent retention of coarse and gelatinous precipitates | Fast | 20-25 | L | 0.21 |
0.06 |
| 5 | Will retain fine precipitates, grained surface | Slow | 2.5 | L | 0.20 |
0.06 |
| 6 | Faster than No.5 but almost as high retention | Slow | 3 | L | 0.18 |
0.20 |
Quantitative Grades – Circles
|
Grade |
Flow Rate | Retention Microns | Wet Strength | Thickness mm |
Ash % |
|
|
Ashless |
General Purpose gravimetric paper | Medium | 8 | L | 0.20 | 0.01 |
|
Ashless |
For filtration of coarse and gelatinous precipitates | Fast | 20-25 | L | 0.19 |
0.06 |
|
Ashless |
Highly retentive for fine precipitates | Slow | 2.5 | L | 0.20 | 0.01 |
|
Ashless |
Intermediate retention and flow rate between Nos 40 and 41 | Medium/Fast | 16 | L | 0.21 |
0.01 |
|
Ashless 44 |
Thin version of No. 42 | Slow | 3 | L | 0.17 | 0.01 |
|
Hardened |
For retention of finest crystalline precipitates. Highly glazed surface | Slow | 2.7 | H | 0.12 |
0.025 |
|
Hardened |
General purpose hardened grade |
Medium | 7 | H | 0.17 |
0.025 |
| Hardened 54 |
For filtration of coarse and gelatinous precipitates | Fast | 20-25 | H | 0.18 |
0.025 |