Grade 44 Ashless Thin Filter Paper, 125mm Circle, 100/Pk SKU: 1444-125

Quantitative Ashless Filter Paper - 1444-125

Trace-level determinations by ignition depend on filter paper with ash content low enough to fall within method-acceptable blank ranges. Certificate of analysis provides lot-specific ash content values for incorporation into method blank calculations and quality records. In turn, lot-level verification of retention, thickness, and ash content ensures predictable performance when scaling from method development to routine analysis.

Key Filter Paper Characteristics

• Particle retention rating of 3um defines the separation threshold for the application, determining which solids are captured and which pass through.
• Certificate of analysis documents actual ash content per production lot, providing traceability for regulated analytical methods.
• Pure cellulose fiber construction without hardening treatment ensures minimal chemical background in filtered samples.
• Tightly controlled manufacturing produces documented ash content that remains consistent across production lots for method reproducibility.
• Controlled fiber density balances rapid filtration with complete precipitate capture for efficient quantitative determinations.

When your analytical procedure specifies a particular grade, the retention and purity characteristics documented above confirm method compliance. For this application, premium cellulose purity reduces the blank correction calculations your gravimetric procedures would otherwise require. 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

125mm

Flow Speed

Slow

Folded/ Fluted/ Pleated

No

Grade

44

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Ash Content (%)

<0.007%

Nominal Basis Weight (g/ m²)

80g/m²

Pack Count

100

Particle Retention

3um

Pore Size (µm)

3

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Nickel Determination - Retains nickel dimethylglyoxime precipitate for ignition-based quantification in alloy and plating bath testing.
• Lead Quantification - Captures lead sulfate precipitate for gravimetric determination in environmental and industrial samples.
• Calcium Oxalate Analysis - Captures calcium precipitate for ignition to calcium oxide, supporting clinical and water hardness testing.
• Total Ash Testing - Provides the ultra-low blank needed for accurate ash determination in food, pharmaceutical, and material samples.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Iron Determination - Collects iron hydroxide precipitate for gravimetric determination in ore assay and environmental analysis.