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Thumbnail Filmstrip of Quantitative Filter Paper Circles, Grade DF541, Hardened Ashless, 42.5mm, 20-25um, 100/Pk Images
Featuring acid-hardened cellulose media engineered for fast, quantitative filtration of aggressive solutions, this Grade DF541 hardened ashless filter paper delivers a nominal particle retention of 20 to 25 micrometers in a convenient 42.5mm circle format, supplied 100 per pack. The acid-hardening treatment reduces ash to an extremely low level while building high wet strength and broad chemical resistance, making the paper well suited to gravimetric procedures involving strong acid and alkali suspensions.
Key Filter Paper Media Characteristics
- Hardened ashless cellulose: Acid-treated to remove trace metals, yielding extremely low ash content and high analytical purity.
- Coarse, fast porosity: A large nominal particle retention of 20 to 25 micrometers supports rapid analytical filtration.
- High wet strength: The hardened surface withstands wet handling and precipitate removal by scraping.
- Broad chemical resistance: Compatible with strong acid and alkali solutions used in gravimetric analysis.
- Hydrophilic structure: Wets readily for consistent, reproducible flow through the depth medium.
Key Construction Characteristics
- Material: Acid-hardened cellulose filter paper.
- Format: 42.5mm diameter circles.
- Classification: Quantitative, hardened, ashless grade.
- Sterility: Nonsterile.
- Pack: 100 circles per pack.
This grade provides reliable, reproducible performance for critical analytical filtration, retaining coarse particles and gelatinous precipitates while preserving sample integrity. Its tough, hardened surface holds up to demanding wet handling so collected precipitates can be recovered cleanly for accurate gravimetric measurement.
- Color
- White
- Diameter
- 42.5mm
- Flow Speed
- Fast
- Grade
- DF541
- Hardened (Yes/ No)
- Yes
- Material
- Filter Paper
- Mesh Format
- Circle
- Nominal Ash Content (%)
- 0.006
- 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 Retains coarse particles and gelatinous precipitates from strong acid or alkali solutions for accurate weight determination.
- Fast Analytical Filtration The coarse, fast porosity delivers rapid throughput for time-sensitive analytical procedures.
- Cement Testing Used in the quantification of chloride in cement during quality control.
- Coal and Coke Analysis Supports determination of chloride and phosphorous content in coal and coke samples.
- Foodstuff Fiber Determination Serves as an animal foodstuff filter for determining fiber content.
- Dairy Analysis Applied in the determination of gelatin content in milk and cream.