DESCRIPTION
DORSAN® provides laboratory technicians with a complete range of filter paper without ash for all types of quantitative analysis.
When burning paper, ash is obtained with a proportion of <0.01%, thus complying with international rules in this area. For the manufacturing of this paper high quality cellulose is used.
Once the paper is manufactured, it is treated with acid and washed with demineralised water. It’s great resistance when wet makes it ideal for use in Büchner filtrations.
FEATURES
Rapid, Medium or Slow Filtration.
Low ash content <0.01%
High resistance in humid state.
Gravimetric analysis.
Cotton and a-cellulose fibres.
Choose between a variety of diameters.
QUALITIES
QUALITY 440. Rapid filtration. Featured on Büchner filtrations or Schöeninger supports combustion. Also recommended for calcium, oxalate, silica… Equivalent to Whatman 40.
QUALITY 441. Medium Filtration. It presents a very good retention of coarse precipitates. ecommended for the laboratories of metallurgical industries (iron or aluminium hydroxides) and food industry analysis. Equivalent to Whatman 41.
QUALITY 442. Very Slow Filtration. It is the filter paper with less ash contein. Very good retention of fine particles (barium and lead sulphates). Equivalent to Whatman 42.
QUALITY 443. Medium Slow Filtration. Determination of sand content and grade of flour in foodstuffs. Recommended for the analysis in electroplating, analisys of alkaline earth carbonates. Equivalent to Whatman 43.
QUALITY 444. Slow Filtration. Recomended for fine crystalline precipitates. Equivalent to Whatman 44.
CHARACTERISTICS OF QUALITATIVE FILTER PAPER
| Quality | Grammage gm² | Thickness mm | Ash Content % (800ºC) | Herzberg (sec.x100 ml) | Rating μm | Filtration Characteristics | Whatman Equivalent. |
|---|---|---|---|---|---|---|---|
| 440 | 85 | 0.20 | <0.01 | 60 | 20-25 | Fast | 40 |
| 441 | 85 | 0.20 | <0.01 | 350 | 5-8 | Medium | 41 |
| 442 | 100 | 0.21 | <0.01 | 1970 | 2-3 | Very Slow | 42 |
| 443 | 85 | 0.20 | <0.01 | 175 | 14-16 | Medium Slow | 43 |
| 444 | 85 | 0.18 | <0.01 | 990 | 3-4 | Slow | 44 |
SIZES AND CODES OF QUALITATIVE FILTER PAPER
| Diameter mm | Grade 440 | Grade 441 | Grade 442 | Grade 443 | Grade 444 |
|---|---|---|---|---|---|
| 55 | 440-055 | 441-055 | 442-055 | 443-055 | 444-055 |
| 70 | 440-070 | 441-070 | 442-070 | 443-070 | 444-070 |
| 90 | 440-090 | 441-090 | 442-090 | 443-090 | 444-090 |
| 110 | 440-110 | 441-110 | 442-110 | 443-110 | 444-110 |
| 125 | 440-125 | 441-125 | 442-125 | 443-125 | 444-125 |
| 150 | 440-150 | 441-150 | 442-150 | 443-150 | 444-150 |
| 185 | 440-185 | 441-185 | 442-185 | 443-185 | 444-185 |
| 240 | 440-240 | 441-240 | 442-240 | 443-240 | 444-240 |
| 320 | 440-320 | 441-320 | 442-320 | 443-320 | 444-320 |
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Note. We reserve the right to modify the information contained in this pamphlet without prior notice.
