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Thumbnail Filmstrip of Quantitative Filter Paper, Grade 540, Hardened Ashless, 320mm Circles, Nonsterile, 100/Pk Images
Featuring an acid-hardened, ashless cellulose medium, this Grade 540 quantitative filter paper delivers medium retention and a medium flow rate in a 320mm diameter circle format. The hardened cellulose construction provides high wet strength and broad chemical resistance, making it well suited to critical analytical filtration of strongly acidic and alkaline samples. Each pack contains 100 hydrophilic circles.
Key Filter Paper Media Characteristics
- Hardened, ashless cellulose medium that is acid treated to reduce ash content to an extremely low level for accurate gravimetric work.
- Hydrophilic surface that wets readily for consistent, reproducible filtration.
- Medium particle retention paired with a medium flow rate for general purpose quantitative filtration.
- High wet strength and a tough, hard surface that resists tearing during filtration and allows precipitates to be scraped from the paper.
- High chemical resistance to strong acid and alkali suspensions.
Key Construction Characteristics
- Cellulose filter paper manufactured from high quality cotton linters.
- Circular disc format, 320mm diameter.
- Quantitative grade, supplied nonsterile.
- Packaged 100 circles per pack.
This Grade 540 paper maintains sample integrity through its low ash, high purity composition and acid hardened surface. The mechanically strong medium withstands demanding filtration conditions while preserving the accuracy required for quantitative and gravimetric analysis.
- Color
- White
- Diameter
- 320mm
- Flow Speed
- Medium
- Grade
- Grade 540, Quantitative
- Hardened (Yes/ No)
- Yes
- Material
- Cellulose
- Mesh Format
- Circle
- Pack Count
- 100
- Particle Retention
- 8 um (typical, in liquid)
- Pore Size (µm)
- 7.0-12.0
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wet Strengthened (Yes/ No)
- Yes
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 540 (1540 series)
- Gravimetric Analysis The hardened, ashless construction supports accurate gravimetric determination where minimal ash residue is essential.
- Metal Analysis in Acid or Alkali Solutions High chemical resistance makes it frequently used in the gravimetric analysis of metals in strongly acidic or alkaline solutions.
- Hydroxide Collection Suited to collecting hydroxides after precipitation by strong alkalis without tearing.
- Precipitate Recovery The tough, acid hardened surface allows precipitates to be scraped from the paper for quantitative recovery.
- General Analytical Filtration Medium retention and medium flow rate make it a versatile choice for routine quantitative laboratory filtration.
- Sample Preparation for Instrumental Analysis Provides clean, low contamination filtrate for downstream instrumental analysis.