Whatman 4716H30PK 1441125 Grade 41 Ashless Quantitative Filter Paper, 125 mm Diameter, 1764 ml/m Flow Rate, 20 μm (Pack of 100)

• Fast filtration of coarse or gelatinous precipitates (20-25 µm particle retention)
• Acid washed, ash content 0.007%
• Especially suitable for iron or aluminum hydroxides; rough surface
• Widely used in determining silicon in iron and steel analysis
• Used for quantitative air pollution analysis when determining gaseous compounds at high flow rates

The fastest ash less filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum hydroxides).