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Suitable for quantitative analysis.
- made of pure cellulose with an alpha cellulose content of almost 100 %
- extremely low ash content (approx. 0.007 %)
- wet-strength
- acid-washed
Information about filter grades
| 388 Black Spot | 389 White spot | 391 Blue spot | |
|---|---|---|---|
| Applications | for coarse and voluminous precipitates such as iron-, aluminium- and chromium hydroxide, Si-determination in steel and pig iron analysis |
coarser precipitates such as lead-, iron- and silver sulphide, alcali carbonates, food stuff and soil analysis |
fine-grained precipitates such as barium sulphate, metastannic acid, cuprous oxide |
| Filtration properties | fast filtering wide pores soft, lose structure coarse crystalline |
medium fast filtering medium pores medium tight medium crystalline |
very slow filtering fine pores very tight very fine crystallines |
| Filtration velocity | 10 s/10 ml | 20 s/10 ml | 180 s/10 ml |
| Filtration time (Herzberg) |
70 s/100 ml 850 ml/min |
150 s/100 ml 375 ml/min |
2500 s/100 ml 25 ml/min |
| Basis weight | 84 g/m2 | 84 g/m2 | 84 g/m2 |
| Typical pore size (Retention range/ recommended guide) |
12 - 15 μm | 8 - 12 μm | 2 - 3 μm |
| Cat. No. | Diameter | Grade | Unit |
|---|---|---|---|
| 6759115 | 125 mm | 388 Black spot | 100 |
| 6759116 | 150 mm | 388 Black spot | 100 |
| 6759215 | 125 mm | 389 White Spot | 100 |
| 6759216 | 150 mm | 389 White Spot | 100 |
| 6759315 | 125 mm | 389 Blue Spot | 100 |
| 6759316 | 150 mm | 389 Blue Spot | 100 |