Biolanbo quantitative filter papers are treated with hydrochloric acid and hydrofluoric acid and washed with distilled water in their manufacturing process, and most of the impurities in the paper fiber are removed, so there is very little ash after burning, so there is almost no impact on the analysis results.Thus they are applied to precise quantitative analysis.
Specification:
| Speed | Particle retention(μm) | Weight(g/cm²) | Flow rate（s） | Wet Burst（mm H2O） | Ash< % |
| High speed 201 | 80-120 | 80±5 | ≤35 | 130mm | ＜0.01 |
| Medium speed 202 | 30-50 | 80±5 | 35-70 | 150mm | ＜0.01 |
| Slow speed 203 | 1-5 | 80±5 | 70-140 | 200mm | ＜0.01 |
.Filtration speed is the time for filtering 10ml（23±1℃）distillated water through 10cm2 filter paper.
