Quantitative Grade, Hardened Ashless
| Grade No. | Flowrate | Retention microns | Wet strength | Thickness, mm | Ash % | |
| 541 | For filtration of coarse and gelatinous precipitates | Fast | 20-25 | High | 0.16 | 0.008 |
FILTER PAPER CIRCLES WHATMAN GRADE NO.541 11CM DIA BOX 100
Quantitative Grade, Hardened Ashless
| Grade No. | Flowrate | Retention microns | Wet strength | Thickness, mm | Ash % | |
| 541 | For filtration of coarse and gelatinous precipitates | Fast | 20-25 | High | 0.16 | 0.008 |