Filter Paper
Filter papers come in a broad range of glass fiber, qualitative and quantitative types for all needs. The success of any laboratory filtration depends upon the correct choice of filter paper. Lab Depot offers a wide range of grades to meet all of your particular filtration needs, with the optimum combination of two important features: retention and flow rate.
Filter Papers
To assist you in choosing the correct filter products, we offer the following guidelines:
Retention (µm) | Flow Rate | Porosity | Grade No. |
11 | Medium | Medium | 1 |
8 | Medium | Medium | 2 |
5 | Medium | Medium | 413 |
Glass Fiber Filters
For filtration of precipitated proteins, cells, cell debris; for dissolved and suspended solids testing in sanitary water analysis procedures; and monitoring specific pollutants.
Retention (µm) | Flow Rate | Porosity | Grade No. |
2.7 | Fast | Coarse | GF/D |
1.6 | Fast | Fine | GF/A |
1.5 | Fast | Fine | 934-AH |
1.3 | Fast | Fine | 693 |
1.2 | Fast | Fine | GF/C |
1.2 | Fast | Fine | 696 |
1.0 | Medium-Fast | Fine | GF/B |
0.7 | Medium | Fine | 151 |
.7 | Medium | Fine | GF/F |
Qualitative Papers
For general laboratory work and analytical operations involving filtration of chemicals, gelatinous, and coarse precipitates.
Retention (µm) | Flow Rate | Porosity | Grade No. |
40 | Fast | Coarse | 417 |
25 | Fast | Coarse | 415 |
25 | Fast | Coarse | 315* |
20-25 | Fast | Coarse | 4 |
6 | Medium | Medium | 3 |
5 | Medium | Medium | 413 |
5 | Medium | Medium Fine | 313* |
2.5 | Slow | Fine | 5 |
1 | Slow | Fine | 410 |
Quantitative Papers
Suitable for general quantitative analysis. These grades are useful for both coarse and fine as well as gelatinous precipitates.
Retention (µm) | Flow Rate | Porosity | Grade No. |
20-25 | Fast | Coarse | 41 |
20-25 | Fast | Coarse | 54 |
20-25 | Fast | Coarse | 541 |
16 | Fast | Medium/Coarse | 43 |
10 | Medium Fast | Medium | 454 |
5-10 | Medium Flow | Medium Fine | 474 |
8 | Medium | Medium | 40 |
3 | Slow | Fine | 44 |
2.5 | Slow | Fine | 42 |
1 | Slow | Fine | 494 |