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Thumbnail Filmstrip of Quantitative Filter Paper, Grade 40, 7-9um, 110mm Circle, Ashless, Medium-Slow, 100/Pk Images
Featuring a high-purity cellulose depth medium refined from pure cotton linters and refined pulp, this quantitative ashless filter paper delivers reliable particle separation for gravimetric and analytical work. Each 110mm circle provides a 7 to 9 micron retention range with a medium-slow flow characteristic, balancing fine particle capture against throughput. The ashless construction holds residue to extremely low levels, protecting the integrity of weight measurements after combustion.
Key Cellulose Media Characteristics
- Naturally hydrophilic cellulose structure wets readily with aqueous samples for consistent filtration.
- 7 to 9 micron retention range captures medium and fine precipitates for quantitative separations.
- Medium-slow flow rate provides clarification of liquids that are harder to filter while maintaining good loading capacity.
- Made of refined pulp and pure cotton linters with an alpha-cellulose content of virtually 100%.
- Ashless construction with ash content below 0.007% to minimize residue in gravimetric methods.
Key Construction Characteristics
- 110mm diameter circles sized for standard analytical funnels and Buchner filtration.
- Nominal thickness of 170 microns for handling strength and consistent performance.
- Nominal basis weight of 85 g/m2 supporting mass uniformity across the sheet.
- Nonsterile and supplied 100 discs per pack.
This grade is suitable for Buchner funnels and filtration under pressure, supporting reproducible results across analytical and gravimetric procedures. The acid-washed, high-purity cellulose minimizes inorganic contamination, helping preserve sample integrity in methods sensitive to background residue. Consistent media properties deliver dependable retention from disc to disc.
- Color
- White
- Diameter
- 110mm
- Flow Speed
- Medium-Slow
- Grade
- DMS40 (Grade 40)
- Material
- Cellulose
- Mesh Format
- Circle
- Nominal Ash Content (%)
- <0.007
- Nominal Basis Weight (g/ m²)
- 85
- Nominal Thickness (µm)
- 170
- Pack Count
- 100
- Particle Retention
- 7-9 um
- Pore Size (µm)
- 7
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 40
- Gravimetric Analysis The ashless cellulose construction with under 0.007% residue supports accurate weight measurements of combusted precipitates.
- Soil Analysis Serves as a primary filter for separating solid matter from aqueous soil extracts in quantitative testing.
- Precipitate Collection The 7 to 9 micron retention range captures medium-sized analytical precipitates for quantitative determination.
- AA Spectrophotometry Prep Functions as a high-purity clean-up filter for solutions prior to atomic absorption analysis.
- Buchner Funnel Filtration Suitable for vacuum and pressure filtration in critical analytical operations.
- Environmental Sample Prep Supports collection of sediments and trace components in environmental and quality control testing.