Quantitative Grade, Hardened
| Grade No. | Flowrate | Retention microns | Wet strength | Thickness, mm | Ash % | |
| 50 | For retention of finest crystalline precipitates. Highly glazed surface | Slow | 2.7 | High | 0.12 | 0.025 |
FILTER PAPER CIRCLES WHATMAN GRADE NO.50 5.5CM DIA BOX 100
