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Thumbnail Filmstrip of Quantitative Filter Paper, Grade 541, Hardened Ashless, 20-25um, 70mm, 100/Pk Images
Featuring acid-hardened ashless cellulose, these Grade 541 quantitative filter paper discs deliver fast filtration with a coarse nominal particle retention of 20 to 25 microns across a 70mm diameter format. The hardening treatment provides high wet strength and broad chemical resistance, making the paper well suited to strongly acidic and alkaline suspensions during gravimetric analysis. With an extremely low ash content, the medium supports accurate weight determination after ashing or ignition.
Key Quantitative Filter Paper Characteristics
- Acid-hardened ashless cellulose construction that maintains high wet strength and a tough surface for critical analytical filtration
- Coarse nominal particle retention of 20 to 25 microns paired with a fast flow rate
- High chemical resistance to strong acid and alkali solutions
- Extremely low ash content for reliable gravimetric and combustion measurements
- Well suited to retention of gelatinous and coarse precipitates
Key Construction Characteristics
- Hardened ashless quantitative grade paper supplied as 70mm circles
- Disc format suitable for Buchner funnels and pressure or vacuum filtration
- Nonsterile, packaged 100 discs per box
This grade provides dependable, repeatable filtration for demanding analytical workflows where speed and durability matter together. The hardened surface withstands aggressive samples while the low ash content preserves sample integrity through downstream weighing and ignition steps.
- Color
- White
- Diameter
- 70mm
- Flow Speed
- Fast
- Grade
- 541
- Hardened (Yes/ No)
- Yes
- Material
- Cellulose (Cotton Linters)
- Membrane Thickness (µm)
- 155
- Mesh Format
- Circle
- Nominal Ash Content (%)
- 0.006
- Nominal Basis Weight (g/ m²)
- 78
- Nominal Thickness (µm)
- 155
- Pack Count
- 100
- Particle Retention
- 20-25 um
- Pore Size (µm)
- 20.0-25.0
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 541
- Gravimetric Analysis Supports accurate weight determination of precipitates through its extremely low ash content and quantitative grade purity.
- Strong Acid and Alkali Filtration Withstands aggressive chemical suspensions thanks to its acid-hardened, high chemical resistance construction.
- Coarse and Gelatinous Precipitate Retention Captures coarse and gelatinous precipitates at a 20 to 25 micron nominal retention with fast flow.
- Industrial Quality Control Used for determinations such as chloride in cement and chloride or phosphorous in coal and coke.
- Food and Feed Analysis Applied to fiber content determination in animal foodstuffs and gelatin content in milk and cream.
- Pressure and Vacuum Filtration High wet strength makes the disc suitable for Buchner funnel and pressure or vacuum filtration setups.