Whatman
Grade 41 Fast Ashless Filter Paper,110mm Circle, 100/Pk SKU: 1441-110

Quantitative Ashless Filter Paper - 1441-110

Methods specifying filter ignition with collected precipitate demand ash contributions that remain negligible and predictable across production lots. Acid-washed cellulose construction reduces inorganic residue to levels below 0.01%, meeting the blank requirements of gravimetric analytical methods. Taken together, consistent physical properties across the full sheet area support uniform filtration results in both gravity and vacuum applications.

Key Filter Paper Characteristics

• Acid-washed cellulose construction produces ash content below 0.01%, meeting the blank value requirements of quantitative gravimetric methods.
• Pure cellulose fiber matrix combines low inorganic residue with the mechanical integrity needed for careful precipitate transfer.
• Rated at 20um particle retention, the fiber matrix provides a defined cutoff for consistent separation across analytical batches.
• Smooth surface finish facilitates complete precipitate recovery and clean separation from the paper during transfer operations.
• Tightly controlled manufacturing produces documented ash content that remains consistent across production lots for method reproducibility.

Scaling your method from development to routine production requires paper consistency at every lot, and the specifications above provide that assurance. To address this, consistent lot-to-lot ash values mean your validated gravimetric method stays valid without recalibrating blank corrections between purchases. Elevate the quality of your analytical data today by standardizing on a filtration product built to meet the exact specifications of your applications.

Diameter

110mm

Flow Speed

Fast

Folded/ Fluted/ Pleated

No

Grade

41

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Ash Content (%)

<0.007%

Nominal Basis Weight (g/ m²)

85g/m²

Pack Count

100

Particle Retention

20um

Pore Size (µm)

20.0-25.0

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Zinc Analysis - Collects zinc ammonium phosphate precipitate for ignition-based quantification in metallurgical and water testing.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.
• Lead Quantification - Captures lead sulfate precipitate for gravimetric determination in environmental and industrial samples.
• Iron Determination - Collects iron hydroxide precipitate for gravimetric determination in ore assay and environmental analysis.
• Sulfate Gravimetry - Retains barium sulfate precipitate for ignition-based sulfate quantification in water and industrial samples.