The quantitative or ashless filter papers are made with 100% high quality cotton linter fibres, which go through a severe chemical process. They have been washed out with a specific acid treatment and finally cleaned from impurities with demineralised water. This process allows reaching an ash content below 0.01%.

• Equivalent to Whatman grade 41
• Recommended for very fast filtration
• Weight: 84g/m²
• Thickness: 0.2mm
• Pore size: 25 - 30µm
• Filtration speed: 9s
• Ash content: 0.01
• Supplied as plain discs