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Thumbnail Filmstrip of Quantitative Filter Paper, Grade 41 Ashless, 20-25um, 320mm Circles, Fast Flow, 100/Pk Images
Featuring an ashless cellulose depth medium engineered from high-purity fibers, this Grade 41 quantitative filter paper delivers the fastest filtration speed in the ashless range. The 320mm diameter circles provide a nominal particle retention of 20 to 25 micrometers, making them well suited to coarse particles and gelatinous precipitates such as iron and aluminum hydroxides. With an extremely low ash content, the medium supports accurate gravimetric analysis where residual ash could otherwise affect the weight of combusted samples.
Key Cellulose Media Characteristics
- Hydrophilic cellulose construction that wets readily and supports rapid, consistent flow through the depth matrix.
- Nominal particle retention of 20 to 25 micrometers for capture of coarse particulates and gelatinous precipitates.
- Fast filtration speed, ranking among the quickest ashless quantitative grades for high-throughput workflows.
- Extremely low ash content that minimizes background contamination in gravimetric and trace analysis.
- High loading capacity for samples carrying heavy particulate burdens.
Key Construction Characteristics
- Material: ashless cellulose filter paper.
- Format: 320mm diameter circles.
- Grade: 41 quantitative, fast flow.
- Sterility: nonsterile.
- Packaging: 100 discs per pack.
This filter paper maintains reliable, reproducible separations across routine and analytical workflows. The low-ash cellulose medium preserves sample integrity and supports accurate gravimetric measurement, while the fast flow rate keeps high-volume filtration efficient.
- Color
- White
- Diameter
- 320mm
- Flow Speed
- Fast
- Grade
- 41 (Quantitative, Fast Flow)
- Material
- Cellulose (Ashless)
- Mesh Format
- Circle
- Nominal Ash Content (%)
- 0.007
- Pack Count
- 100
- Particle Retention
- 20-25 um
- Pore Size (µm)
- 20-25
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 41
- Gravimetric Analysis The extremely low ash content supports accurate weight determination of combusted precipitates.
- Air Pollution Monitoring Fast flow makes the paper suitable for collecting particulates and impregnation in quantitative air pollution analysis.
- Environmental Sample Preparation Used to prepare solid samples such as soils and sludges for metals analysis after acid digestion.
- Coarse Precipitate Filtration Captures coarse and gelatinous precipitates such as iron and aluminum hydroxides.
- Soil Analysis Separates solid matter from aqueous extracts in routine soil testing.
- High-Throughput Filtration The fast filtration speed maximizes throughput when processing large sample volumes.