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Thumbnail Filmstrip of Quantitative Filter Paper, Ashless, Fast, 20-25um Retention, 55mm Circle, 100/Pk Images
Featuring a refined cellulose matrix made from pure cotton linters with a virtually 100% alpha-cellulose content, this ashless quantitative filter paper delivers fast, high-throughput filtration for gravimetric and quantitative analysis. The 55mm circle provides a 20-25um particle retention range and a nominal thickness of 190um, with an ash content of less than 0.007% so that no meaningful contaminants are introduced during filtration. This fast grade is the GVS DFA41 (Whatman Grade 41 equivalent), suited to coarse particles and gelatinous precipitates.
Key Cellulose Filter Paper Characteristics
- Manufactured from refined pulp and pure cotton linters with virtually 100% alpha-cellulose content.
- Ashless construction with less than 0.007% ash content for accurate gravimetric work.
- Fast filtration speed (filtration time for distilled water of 21 seconds) with a coarse 20-25um retention range.
- Hydrophilic medium ideal for high-flow filtration of coarse particles and gelatinous precipitates such as iron or aluminum hydroxides.
- Wet bursting strength of 40kPa supports use in Buchner funnels and filtration under pressure.
Key Construction Characteristics
- Disc format, 55mm diameter, supplied 100 discs per box.
- Nominal thickness of 190um with a weight of 80g.
- Quantitative ashless grade for analytical sample preparation and gravimetric analysis.
This filter paper maintains consistent retention and purity across the batch, supporting reproducible quantitative results. Its fast flow rate and low ash content protect sample integrity during demanding analytical filtration. The cellulose matrix offers the mechanical strength needed for Buchner funnel and pressure filtration workflows.
- Diameter
- 55mm
- Flow Speed
- Fast
- Grade
- DFA41
- Material
- Cellulose
- Mesh Format
- Circle
- Nominal Ash Content (%)
- <0.007
- Nominal Thickness (µm)
- 190
- Pack Count
- 100
- Particle Retention
- 20-25 µm
- Pore Size (µm)
- 20-25
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 41
- Gravimetric Analysis The ashless cellulose matrix with under 0.007% ash content supports accurate weighing of recovered precipitates.
- Coarse Precipitate Filtration The 20-25um retention range is recommended for coarse particles and gelatinous precipitates such as iron or aluminum hydroxides.
- High-Throughput Filtration The fast flow rate maximizes sample throughput where speed is prioritized over fine retention.
- Air Pollution Analysis Used as a paper tape for impregnation when determining gaseous compounds at high flow rates.
- Environmental Sample Prep Suited to preparing solid environmental samples such as soils and sludges for metals analysis after nitric acid digestion.
- Pressure Filtration Wet bursting strength of 40kPa makes it suitable for Buchner funnels and filtration under pressure.