General Properties of FILTROS (UK) Filter Papers
| Grades | Reference Grade | Particle Retention Liquid (µm) | Filtration Speed | Ash % | Thickness (mm) | Weight (g/m2) |
|---|---|---|---|---|---|---|
| Qualitative | ||||||
| 2001 | 1 | 10 | Medium | 0.06 | 0.180 | 87 |
| 2002 | 2 | 7-9 | Medium Slow | 0.06 | 0.190 | 100 |
| 2003 | 3 | 5-7 | Medium Slow | 0.06 | 0.390 | 190 |
| 2004 | 4 | 20-25 | Fast | 0.06 | 0.210 | 95 |
| 2005 | 5 | 2-3 | Very Slow | 0.06 | 0.200 | 100 |
| Ashless Quantitative | ||||||
| 1040 | 40 | 7-9 | Medium Slow | 0.007 | 0.210 | 95 |
| 1041 | 41 | 20-25 | Fast | 0.007 | 0.220 | 85 |
| 1042 | 42 | 2-3 | Very Slow | 0.007 | 0.200 | 100 |
| 1043 | 43 | 15-17 | Medium Fast | 0.007 | 0.220 | 95 |
| 1044 | 44 | 3-4 | Slow | 0.007 | 0.180 | 80 |
| Hardened Low Ash | ||||||
| 1050 | 50 | 2-4 | Slow | 0.015 | 0.180 | 100 |
| 1052 | 52 | 7-9 | Medium Slow | 0.015 | 0.180 | 95 |
| 1054 | 54 | 20-25 | Fast | 0.015 | 0.190 | 90 |
| Hardened Ashless | ||||||
| 2540 | 540 | 7-9 | Medium Slow | 0.007 | 0.170 | 85 |
| 2541 | 541 | 20-25 | Very Fast | 0.007 | 0.160 | 80 |
| 2542 | 542 | 2-4 | Slow | 0.007 | 0.170 | 0.16 |
| Glass Microfiber | ||||||
| GMFA | GF/A | 1.6 | 60 | NA | 0.260 | 52 |
| GMFB | GF/B | 1.0 | 200 | NA | 0.700 | 143 |
| GMFC | GF/C | 1.2 | 98 | NA | 0.260 | 52 |
| GMFD | GF/D | 2.7 | 40 | NA | 0.680 | 120 |
| GMFF | GF/F | 0.7 | 330 | NA | 0.430 | 75 |
| MEPM 2000 | EPM 2000 | 2.0 | NA | NA | 0.430 | 80 |