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Thumbnail Filmstrip of Quantitative Filter Paper Discs, Ashless, 7-9um Retention, 90mm, Medium-Slow, 100/Pk Images
Featuring a high-purity cotton linter cellulose medium with a medium-slow filtration speed, these 90mm quantitative filter paper discs deliver a nominal retention range of 7 to 9 micrometers for reliable gravimetric and analytical work. The acid-hardened, ashless construction provides high wet strength and chemical resistance, while a nominal thickness of 170um and a basis weight of 80g supports dependable solute loading during demanding separations.
Key Filter Paper Media Characteristics
- Hydrophilic cotton linter cellulose with high alpha-cellulose purity for low-contamination filtration
- Nominal particle retention range of 7 to 9 micrometers with a medium-slow filtration profile
- Acid-hardened, ashless treatment delivering high wet strength and chemical resistance to strong acids and alkalis
- Nominal thickness of 170um for increased wet strength and higher solute loading capacity
- Wet bursting strength of 36kPa for handling under demanding filtration conditions
Key Construction Characteristics
- Circular disc format measuring 90mm in diameter
- Quantitative, ashless grade suited to gravimetric analysis
- Nonsterile, supplied 100 discs per pack
- Filtration time for distilled water of approximately 100 seconds
These discs maintain consistent retention and flow performance across analytical batches, supporting accurate gravimetric results. The hardened, low-ash structure preserves sample integrity by minimizing residue contribution during ashing and downstream measurement. The robust wet strength allows confident handling during transfer and filtration of difficult precipitates.
- Diameter
- 90mm
- Flow Speed
- Medium-Slow
- Grade
- Quantitative
- Hardened (Yes/ No)
- Yes
- Material
- Cotton Linter Cellulose
- Membrane Thickness (µm)
- 170
- Mesh Format
- Circle
- Nominal Basis Weight (g/ m²)
- 80
- Nominal Thickness (µm)
- 170
- Pack Count
- 100
- Particle Retention
- 7-9 um
- Pore Size (µm)
- 7-9
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 540
- Gravimetric Analysis The ashless, low-residue cellulose makes these discs well suited to gravimetric determination of metals in acidic or alkaline solutions.
- Precipitate Filtration The 7-9 micron medium-slow retention captures fine precipitates such as hydroxides collected after precipitation by strong alkalis.
- Sample Clarification The hydrophilic cellulose medium clarifies liquids and removes particulate prior to instrumental analysis.
- Acid and Alkali Sample Processing Acid-hardened construction provides chemical resistance for filtering strongly acidic or alkaline suspensions.
- Quantitative Analytical Prep Low ash content supports preparation of samples for accurate quantitative measurement.
- General Laboratory Filtration Robust wet strength enables routine filtration of difficult or loaded samples under demanding conditions.