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%. Slow filtration quantitative filter paper.

• Equivalent to Whatman grade 44
• Recommended for slow filtration.
• Weight: 74g/m²
• Thickness: 0.16mm
• Pore size: 7 - 9µm
• Filtration speed: 100s
• Supplied as plain discs