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Thumbnail Filmstrip of Quantitative Filter Paper Discs, Hardened Ashless, Grade 540, 47mm, Medium Flow, 100/Pk Images
Featuring acid-hardened, ashless cellulose, these Grade 540 quantitative filter paper discs deliver medium retention and a medium flow rate for critical gravimetric work. Each 47mm circle is treated with strong acid to remove trace metals, producing high wet strength and broad chemical resistance, with an extremely low maximum ash content of 0.006%. The hard, tough surface withstands strong acid and alkali solutions and allows precipitates to be scraped cleanly from the paper. Supplied 100 discs per pack.
Key Filter Paper Characteristics
- Hardened ashless cellulose with a maximum ash content of 0.006% for accurate gravimetric and quantitative analysis.
- Medium particle retention paired with a medium flow rate, suited to medium-sized precipitates such as most metal sulphides.
- Acid-hardened surface delivers high wet strength and resistance to strong acids and alkalis.
- Hard, tough surface resists tearing and permits precipitates to be scraped from the paper after filtration.
- Compatible with pressure filtration and Buchner funnel setups.
Key Construction Characteristics
- Grade DF540 hardened ashless quantitative filter paper.
- 47mm diameter circles.
- Hydrophilic cellulose media.
- Nonsterile, 100 discs per pack.
These discs maintain consistent retention and flow for reliable, reproducible separations. The high-purity, acid-treated cellulose protects sample integrity during gravimetric analysis of metals in acidic or alkaline solutions and in the collection of hydroxides after precipitation by strong alkalis.
- Color
- White
- Diameter
- 47mm
- Flow Speed
- Medium
- Grade
- DF540
- Hardened (Yes/ No)
- Yes
- Material
- Filter Paper
- Mesh Format
- Circle
- Nominal Ash Content (%)
- 0.006
- Pack Count
- 100
- Pore Size (µm)
- 7.0-12.0
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Sterilization
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 540
- Gravimetric Analysis Frequently used for the gravimetric determination of metals in acidic or slightly alkaline solutions where ashless, high-purity media is required.
- Precipitate Filtration Retains medium-sized precipitates such as most metal sulphides thanks to its medium retention rating.
- Hydroxide Collection Collects hydroxides after precipitation by strong alkalis without compromising sample integrity.
- Pressure Filtration The acid-hardened, high wet strength surface withstands pressure filtration setups.
- Buchner Funnel Filtration Suited to vacuum and Buchner funnel filtration of analytical precipitates.
- Sample Preparation for Instrumental Analysis Prepares clarified samples for downstream instrumental and quantitative analysis.