Whatman quantitative filter papers

Ashless characteristics:
• Made from cotton fibres of high quality in rooms with controlled dust.
• High purity filter for a wide range of critical applications
• 0.007 % ashes maximum

Enhanced low ash characteristics:
• Treatment with strong acids to improve the chemical resistance and strength after wetting
• Smooth surface for the recovery of precipitates
• 0.015 % ashes maximum

Enhanced ashless characteristics:
• Acid treatment for better resistance after wetting in combination with a very low ash residue
• Smooth and resistant surface for a wide variety of manipulations
• 0.006 % ashes maximum