Filter circles - quantitative. Slow ashless filter paper. Equivalent to blue ribbon. Retention of very fine particles. Standard paper for critical gravimetric analysis of fine precipitates like barium sulfate or metastannic acid.
- Filtration speed acc. to DIN 53237: 140 s.
- Thickness: 0.17 mm.
- Weight: 85 g / m².
- Ash-content: < 0.01 %.