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Thumbnail Filmstrip of Quantitative Ashless Filter Paper, Grade 40, Medium-Slow, 7-9um, 90mm Circle, 100/Pk Images
Featuring a high-purity cellulose medium produced from refined pulp and pure cotton linters with an alpha-cellulose content of nearly 100%, this 90mm quantitative ashless filter paper delivers reliable performance for gravimetric work. The medium-slow DMS40 grade provides a nominal particle retention range of 7 to 9um and a nominal thickness of 170um at a basis weight of 80 g/m2. With ash content held below 0.007%, the paper minimizes background contamination so combusted residue does not distort weight measurements.
Key Cellulose Media Characteristics
- Quantitative ashless grade with ash content below 0.007%, suited to gravimetric methods where the filter is ashed alongside the sample
- Nominal particle retention range of 7 to 9um for medium-slow filtration with fine particle capture
- Constructed from refined pulp and pure cotton linters with an alpha-cellulose content of nearly 100% for high purity
- Naturally hydrophilic surface that wets readily with aqueous samples
- Nominal thickness of 170um and 80 g/m2 basis weight balancing loading capacity and flow
Key Construction Characteristics
- 90mm diameter circle format for funnel and Buchner filtration
- Wet bursting strength of 36kPa for handling during wet transfer
- Nonsterile, supplied 100 discs per box
- Equivalent to Whatman Grade 40 for method cross-referencing
This medium-slow quantitative paper maintains consistent retention and low residue across the filtration cycle, protecting the integrity of gravimetric determinations. Its high alpha-cellulose purity supports accurate analysis in workflows sensitive to low levels of background contamination. The 90mm circle format provides ample area for routine analytical separations and sample preparation.
- Color
- White
- Diameter
- 90mm
- Flow Speed
- Medium-Slow
- Grade
- DMS40
- Material
- Cellulose
- Mesh Format
- Circle
- Nominal Ash Content (%)
- 0.007
- Nominal Basis Weight (g/ m²)
- 80
- Nominal Thickness (µm)
- 170
- Pack Count
- 100
- Particle Retention
- 7-9 µm
- Pore Size (µm)
- 7-9
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 40
- Gravimetric Analysis The ashless cellulose with under 0.007% residue allows the filter to be combusted with the sample for accurate mass determinations.
- Medium-Slow Precipitate Filtration The 7 to 9um retention range captures medium and fine analytical precipitates such as calcium oxalate and calcium carbonate.
- Soil and Environmental Sample Prep Separates solid matter from aqueous extracts for quantitative soil and water analysis.
- Sample Preparation for Instrumental Analysis Clarifies solutions prior to AA, ICP, or spectrophotometric measurement to protect instrumentation.
- Buchner and Vacuum Filtration The 90mm circle format and 36kPa wet bursting strength support funnel and vacuum-assisted filtration.
- Routine Quantitative Separations Provides a stable retention baseline for repeatable laboratory gravimetric workflows.