Whatman
Grade 541 Ashless Fast Filter Paper, 185mm Circles (100 pcs) SKU: 1541-185

Quantitative Ashless Filter Paper - 1541-185

Gravimetric analysis demands filter paper that contributes virtually no residue after ignition, ensuring mass measurements reflect the sample alone. Fine fiber matrix delivers the mechanical integrity needed to transfer collected precipitates from funnel to crucible without loss. On this basis, lot-level verification of retention, thickness, and ash content ensures predictable performance when scaling from method development to routine analysis.

Key Filter Paper Characteristics

• Acid-hardened cellulose resists degradation during prolonged contact with strong reagents, protecting filtrate integrity.
• Certificate of analysis documents actual ash content per production lot, providing traceability for regulated analytical methods.
• Manufactured under controlled acid washing conditions, each sheet delivers consistent ash levels across production lots for method reproducibility.
• Manufactured to a basis weight of 82g/m², each sheet delivers the documented mass consistency that gravimetric methods require.
• Ashless filter paper provides the documented low residue needed for ignition-based analytical procedures where filter mass affects results.

When your budget requires balancing performance with cost efficiency, the documented consistency above ensures you're not paying for premium features you don't need. Documented ash specifications on every lot give you the traceability your regulated analytical methods and quality audits require. Make the decision for consistency and reliability, ensuring that your laboratory maintains its reputation for high-quality, error-free output.

Diameter

185mm

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

• Zinc Analysis - Collects zinc ammonium phosphate precipitate for ignition-based quantification in metallurgical and water testing.
• Sulfate Gravimetry - Retains barium sulfate precipitate for ignition-based sulfate quantification in water and industrial 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.
• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.
• Iron Determination - Collects iron hydroxide precipitate for gravimetric determination in ore assay and environmental analysis.