Grade 44 Ashless Thin Filter Paper, 70mm Circle, 100/Pk SKU: 1444-070

Quantitative Ashless Filter Paper - 1444-070

Multi-step analytical procedures ending in gravimetric determination need paper that survives reagent contact and delivers minimal residue on ignition. Cellulose purity and documented ash specifications position ashless paper as the standard medium for ignition-based quantitative determinations. Taken together, from fiber selection through final inspection, the manufacturing process ensures every sheet meets the performance specifications of its grade.

Key Filter Paper Characteristics

• Smooth surface finish facilitates complete precipitate recovery and clean separation from the paper during transfer operations.
• Tightly controlled manufacturing produces documented ash content that remains consistent across production lots for method reproducibility.
• Acid-washed cellulose construction produces ash content below 0.01%, meeting the blank value requirements of quantitative gravimetric methods.
• 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.

If your teaching or research laboratory processes high volumes of routine samples, the documented flow rates above translate directly to throughput. To that end, acid-washed cellulose removes the inorganic contaminants that would otherwise introduce blank errors in your ignition-based quantitative determinations. Make the decision for consistency and reliability, ensuring that your laboratory maintains its reputation for high-quality, error-free output.

Diameter

70mm

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

• Silica Determination - Captures dehydrated silica for gravimetric analysis in cement, geological, and industrial raw material testing.
• Lead Quantification - Captures lead sulfate precipitate for gravimetric determination in environmental and industrial samples.
• Gravimetric Determination - Collects and ignites precipitates for accurate mass measurement with negligible filter blank contribution.
• Total Ash Testing - Provides the ultra-low blank needed for accurate ash determination in food, pharmaceutical, and material samples.
• Iron Determination - Collects iron hydroxide precipitate for gravimetric determination in ore assay and environmental analysis.
• Phosphate Gravimetry - Collects magnesium ammonium phosphate precipitate for ignition to pyrophosphate in soil and fertilizer analysis.