Whatman
Grade 41 Fast Ashless Filter Paper, 90mm Circle 100/Pk SKU: 1441-090

Quantitative Ashless Filter Paper - 1441-090

Methods specifying filter ignition with collected precipitate demand ash contributions that remain negligible and predictable across production lots. Smooth fiber surface facilitates clean precipitate release during transfer operations from funnel to crucible. Consequently, rigorous quality control at every production stage ensures physical properties align with published grade specifications before distribution.

Key Filter Paper Characteristics

• Smooth surface finish facilitates complete precipitate recovery and clean separation from the paper during transfer operations.
• Unmodified cellulose surface provides natural hydrophilic properties for rapid wetting in aqueous filtration applications.
• Certificate of analysis documents actual ash content per production lot, providing traceability for regulated analytical methods.
• Acid washing process removes metallic contaminants that could interfere with trace element determinations after ignition.
• Controlled fiber density balances rapid filtration with complete precipitate capture for efficient quantitative determinations.

If your laboratory supports multiple research groups with varying filtration needs, this paper's broad applicability simplifies your procurement process. To support this, consistent lot-to-lot ash values mean your validated gravimetric method stays valid without recalibrating blank corrections between purchases. Secure your research outcomes by partnering with a filtration solution that understands your need for speed, accuracy, and reproducibility.

Diameter

90mm

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

• Total Ash Testing - Provides the ultra-low blank needed for accurate ash determination in food, pharmaceutical, and material samples.
• Calcium Oxalate Analysis - Captures calcium precipitate for ignition to calcium oxide, supporting clinical and water hardness testing.
• 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.
• Aluminum Analysis - Collects aluminum hydroxide precipitate for ignition and weighing in metallurgical and environmental methods.
• Chloride Gravimetry - Retains silver chloride precipitate for mass-based chloride determination in water quality and process control.