Quantitative Grade, Ashless
| Grade No. | Flowrate | Retention microns | Wet strength | Thickness, mm | Ash % | |
| 44 | Thin version of No.42 | Slow | 3 | Low* | 0.17 | 0.01 |
*Suitable for gravity or low suction filtration. Care must be taken to prevent rupture of the paper.
FILTER PAPER CIRCLES WHATMAN GRADE NO.44 12.5CM DIA BOX 100
