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Thumbnail Filmstrip of Quantitative Hardened Ashless Filter Paper, Grade 540, 8um, 240mm Circles, 100/Pk Images
Featuring acid-hardened cotton linter media, this Grade 540 quantitative filter paper delivers a 240mm circle format with an 8um nominal particle retention and a medium filtration speed. The acid treatment removes trace metals and produces an extremely low ash content of 0.006% maximum, making it well suited for gravimetric and quantitative analysis where filter mass and inorganic residue affect results. Its hardened, tough surface provides high wet strength and broad chemical resistance to strongly acidic and alkaline samples.
Key Quantitative Filter Paper Characteristics
- Hardened ashless construction acid-treated to reduce ash to 0.006% maximum, minimizing inorganic residue after ignition.
- 8um nominal particle retention with medium retention and medium flow rate for general quantitative filtration.
- High wet strength from acid hardening, producing a tough surface that resists tearing during filtration.
- High chemical resistance to strong acid and alkali suspensions.
- High-purity cotton linter media that allows precipitates to be scraped cleanly from the paper surface.
Key Construction Characteristics
- Material: high-quality cotton linters, hardened.
- Format: 240mm diameter circles.
- Grade: 540 hardened ashless quantitative.
- Sterility: Nonsterile.
- Pack: 100 per pack.
This filter paper maintains documented ash specifications and consistent retention across production lots, supporting method reproducibility in regulated analytical workflows. The hardened surface preserves sample integrity by enabling complete precipitate recovery and clean transfer. Reliable wet strength and chemical resistance make it dependable for critical gravimetric determinations involving strongly acidic or alkaline matrices.
- Color
- White
- Diameter
- 240mm
- Flow Speed
- Medium (Herzberg 200 s)
- Grade
- Grade 540
- Hardened (Yes/ No)
- Yes
- Material
- High-Quality Cotton Linters
- Mesh Format
- Circle
- Nominal Ash Content (%)
- 0.006
- Nominal Basis Weight (g/ m²)
- 85
- Nominal Thickness (µm)
- 160
- Pack Count
- 100
- Particle Retention
- 8 um
- Pore Size (µm)
- 8
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wet Strengthened (Yes/ No)
- Yes
- Wettability
- Hydrophilic
- Whatman Equivalent
- 1540-240
- Gravimetric Analysis Provides documented low ash content of 0.006% maximum for ignition-based gravimetric determinations where filter mass affects results.
- Metals Analysis in Acid or Alkali Solutions The hardened, chemically resistant surface withstands strongly acidic and alkaline suspensions during metals determination.
- Hydroxide Collection Captures hydroxides after precipitation by strong alkalis while maintaining high wet strength.
- Quantitative Precipitate Filtration The 8um nominal retention captures medium precipitates for routine quantitative laboratory filtration.
- Sample Preparation for Instrumental Analysis Clarifies samples ahead of downstream instrumental measurement with minimal residue contribution.
- Critical Analytical Filtration The tough acid-hardened surface suits demanding analytical operations requiring tear resistance and clean precipitate recovery.