Grade 41 Fast Ashless Filter Paper, 240mm Circle 100/Pk SKU: 1441-240

Quantitative Ashless Filter Paper - 1441-240

Trace-level determinations by ignition depend on filter paper with ash content low enough to fall within method-acceptable blank ranges. Controlled washing process removes metallic and mineral contaminants that would otherwise contribute measurable mass after ignition. Quality-controlled production produces filter paper with the documented consistency that reproducible analytical and preparative methods demand.

Key Filter Paper Characteristics

• Certificate of analysis documents actual ash content per production lot, providing traceability for regulated analytical methods.
• Controlled fiber density balances rapid filtration with complete precipitate capture for efficient quantitative determinations.
• Designed for gravimetric determinations where the filter paper is ashed or ignited as part of the analytical measurement step.
• Acid-washed cellulose construction produces ash content below 0.01%, meeting the blank value requirements of quantitative gravimetric methods.
• Tightly controlled manufacturing produces documented ash content that remains consistent across production lots for method reproducibility.

When your analytical procedure specifies a particular grade, the retention and purity characteristics documented above confirm method compliance. Ashless purity positions this paper as your standard medium for any method where the filter becomes part of the final measurement. Take control of your sample preparation variables and ensure that your data reflects the true nature of your work, rather than the quality of your consumables.

Diameter

240mm

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.
• Aluminum Analysis - Collects aluminum hydroxide precipitate for ignition and weighing in metallurgical and environmental methods.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Calcium Oxalate Analysis - Captures calcium precipitate for ignition to calcium oxide, supporting clinical and water hardness testing.
• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.
• Nickel Determination - Retains nickel dimethylglyoxime precipitate for ignition-based quantification in alloy and plating bath testing.