Whatman
Grade 541 Ashless Fast Filter Paper, 270mm Circles (100 pcs) SKU: 1541-270

Quantitative Ashless Filter Paper - 1541-270

Accurate mass-based determinations start with a filter medium whose residue after ignition is controlled, tested, and traceable. Acid-washed cellulose construction reduces inorganic residue to levels below 0.01%, meeting the blank requirements of gravimetric analytical methods. Certificate of conformance documentation accompanies each lot, providing traceability for quality systems and regulatory audit requirements.

Key Filter Paper Characteristics

• Nominal basis weight of 82g/m² reflects the fiber density that determines flow rate, retention, and mechanical handling characteristics.
• Controlled fiber density balances rapid filtration with complete precipitate capture for efficient quantitative determinations.
• Nominal retention of 22um provides the particle size cutoff appropriate for the analytical or preparative separation method.
• Tightly controlled manufacturing produces documented ash content that remains consistent across production lots for method reproducibility.
• Acid washing process removes metallic contaminants that could interfere with trace element determinations after ignition.

Whether your method requires simple clarification or precise gravimetric determination, the documented specifications above define what this paper delivers. To support this, ultra-low ash content ensures your gravimetric results reflect captured material, not residue from the filter paper itself. Make the decision for consistency and reliability, ensuring that your laboratory maintains its reputation for high-quality, error-free output.

Diameter

270mm

Flow Speed

Fast

Folded/ Fluted/ Pleated

No

Grade

541

Hardened (Yes/ No)

Yes

Material

Cellulose Fiber

Nominal Ash Content (%)

<0.006%

Nominal Basis Weight (g/ m²)

82g/m²

Pack Count

100

Particle Retention

22um

Pore Size (µm)

20.0-25.0

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

Yes

Wettability

Hydrophilic

• Nickel Determination - Retains nickel dimethylglyoxime precipitate for ignition-based quantification in alloy and plating bath testing.
• Sulfate Gravimetry - Retains barium sulfate precipitate for ignition-based sulfate quantification in water and industrial samples.
• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Chloride Gravimetry - Retains silver chloride precipitate for mass-based chloride determination in water quality and process control.
• Silica Determination - Captures dehydrated silica for gravimetric analysis in cement, geological, and industrial raw material testing.