Quantitative Ashless Filter Paper, Grade 44, Slow, 2-4um, 47mm Disc, 100/Pk
GVS SKU: FP047DSL44QANC01

Featuring a high-purity cellulose medium made from refined pulp and cotton linters with a near 100% alpha-cellulose content, this Grade 44 quantitative ashless filter paper delivers a slow flow rate with a 2 to 4 um particle retention range for critical analytical filtration. The thin 160 um disc carries an ash content below 0.007%, supporting accurate ash-free dry mass measurements where minimal residue is essential. Each 47mm disc provides a measured filtration time of 292 seconds for distilled water and a wet bursting strength of 52 kPa.

Key Cellulose Filter Paper Characteristics

• Naturally hydrophilic cellulose medium for reliable aqueous sample filtration.
• Slow flow rate with a fine 2 to 4 um particle retention range for very fine precipitates.
• Ashless construction with ash content below 0.007% for accurate gravimetric analysis.
• Manufactured from refined pulp and pure cotton linters with virtually 100% alpha-cellulose content.
• Thin 160 um structure reduces ash weight per sample compared with thicker grades.

Key Construction Characteristics

• Quantitative ashless cellulose composition for high-purity analytical work.
• 47mm disc format suited to Buchner funnels and filtration under pressure.
• Wet bursting strength of 52 kPa supports use under applied pressure.
• Nominal thickness of 160 um and a nominal basis weight of 85 g/m2.
• Supplied 100 discs per box, nonsterile.

This filter paper maintains consistent retention and purity across critical filtration procedures, helping preserve sample integrity in quantitative analysis. Its fine retention and low ash content make it well suited for gravimetric work that relies on accurate ash-free dry weights.

Diameter

47mm

Flow Speed

Slow

Grade

44 (DSL44)

Hardened (Yes/ No)

No

Material

Cellulose

Mesh Format

Circle

Nominal Ash Content (%)

<0.007

Nominal Basis Weight (g/ m²)

85

Nominal Thickness (µm)

160

Pack Count

100

Particle Retention

2-4 um

Pore Size (µm)

2-4

Qualitative/ Quantitative

Quantitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

Whatman Equivalent

Grade 44

• Gravimetric Analysis The ashless construction with under 0.007% ash supports accurate ash-free dry mass determination of collected precipitates.
• Fine Precipitate Filtration The 2 to 4 um retention range captures very fine precipitates such as barium sulfate and metal hydroxides.
• Sample Preparation for Instrumental Analysis High-purity cellulose clarifies samples ahead of downstream analytical instrumentation.
• Buchner Funnel Filtration The disc format and 52 kPa wet bursting strength suit vacuum and pressure filtration setups.
• Quantitative Analytical Chemistry Slow flow and fine retention provide thorough capture of fine particulates in critical analyses.