Hardened ashless filters (ash content approx. 0.003%), especially recommended for filtration applications requiring vacuum and pressure filtration, and for the use of acidic and alkaline solutions.
- Made of super-refined cotton linters and cellulose
- Acid-washed and free of minerals and metallic ions, ideal for the detection of metallic ions
- Very high wet strength; easy to scrap off or wash off precipitates
- Hardened by small quantities of nitrogen-containing resin, which does not introduce significant impurities into the filtrate
- High resistance to aggressive chemical components, like sulphuric and nitric acids (up to 40 % at 50 ° Celsius) and alkalis (up to 10 % at 20 ° Celsius)
- For analytical applications, routine quantitative and /or gravimetric procedures
Specification:
| Grade | Sample | Speed | Retention rate* [µm] | Filtration Herzberg (s) | Thickness | Weight [g/m²] |
| B15540 | Fine crystalline precipitates | Medium | 4-12 | 170 | 0.16 | 90 |
| B15542 | Very fine crystalline precipitates | Slow | ? 2 | 600** | 0.14 | 90 |
* Approximate values, ** Measured with 100mm water column instead of 50 mm
