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Thumbnail Filmstrip of Quantitative Filter Paper, Grade DMS40, 7-9um, 320mm, Ashless, Medium-Slow, 100/Pk Images
Featuring an ashless cellulose medium refined from pure pulp and cotton linters with nearly 100% alpha-cellulose content, this quantitative Grade DMS40 filter paper delivers a medium-slow filtration speed with a nominal particle retention of 7 to 9 microns. Supplied as 320mm circles in packs of 100, the paper combines fine particle retention with the ultra-low residue required for accurate gravimetric work. Each circle measures 170 microns thick at a nominal basis weight of 85 g/m2, providing the mass uniformity needed for reproducible analytical determinations.
Key Cellulose Media Characteristics
- Refined from pure pulp and cotton linters with virtually 100% alpha-cellulose content for analytical purity
- Ashless construction with an ash content of less than 0.007%, protecting the integrity of gravimetric weight measurements after combustion
- Nominal particle retention of 7 to 9 microns suited to fine precipitates
- Medium-slow filtration speed balancing retention with usable flow
- Naturally hydrophilic surface wets readily with aqueous samples
Key Construction Characteristics
- 320mm diameter circle format for large-funnel and Buchner applications
- Nominal thickness of 170 microns with an 85 g/m2 nominal basis weight
- Nonsterile, supplied 100 circles per pack
- Compatible with Buchner funnels and filtration under pressure
This quantitative paper maintains consistent retention and low residue across its working range, supporting reliable separation of fine precipitates. The ashless cellulose construction preserves sample integrity through ashing steps, making it well suited to gravimetric methods where blank values must remain minimal.
- Color
- White
- Diameter
- 320mm
- Flow Speed
- Medium-Slow
- Grade
- DMS40
- Material
- Cellulose
- 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
- Sartorius Equivalent
- 5B
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 40
- Gravimetric Analysis The ashless cellulose with less than 0.007% residue allows the filter to be ashed alongside the sample without compromising weight measurements.
- Fine Precipitate Filtration The 7 to 9 micron retention captures fine analytical precipitates such as finely precipitated calcium carbonate for quantitative recovery.
- Buchner Funnel Filtration The medium-slow medium supports clarification of difficult samples in Buchner funnels and under pressure.
- Soil and Water Analysis The fine retention and low ash content suit clarification steps in environmental sample preparation.
- Sample Clarification The hydrophilic cellulose medium clarifies cloudy aqueous suspensions ahead of analytical determination.