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Thumbnail Filmstrip of Hardened Ashless Quantitative Filter Paper, Grade 540, 8um, 185mm, Nonsterile, 100/Pk Images
Featuring a high-purity, acid-hardened cellulose medium produced from quality cotton linters, this Grade 540 quantitative filter paper delivers reliable performance for gravimetric and analytical work. Supplied as 185mm circles in a pack of 100, the hardened ashless structure provides a nominal particle retention of 8 microns at a medium flow rate, with an extremely low ash content of 0.006% maximum so no measurable contaminants are introduced during filtration. The acid treatment imparts high wet strength and broad chemical resistance to strongly acidic and alkaline suspensions.
Key Filter Paper Media Characteristics
- Hardened ashless cellulose: acid-treated cotton linters fiber matrix with a tough surface that resists tearing during filtration.
- Nominal particle retention: 8 microns with a medium flow rate (Herzberg filtration speed 200 seconds).
- Extremely low ash: 0.006% maximum ash content for quantitative and gravimetric accuracy.
- Chemical resistance: high resistance to strong acid and alkali suspensions, suiting metal hydroxide collection.
- Hydrophilic structure: naturally hydrophilic medium that wets readily with aqueous samples.
Key Construction Characteristics
- Format: 185mm diameter circles supplied in packs of 100.
- Grade: quantitative, hardened ashless Grade 540 with medium retention and flow.
- Nominal thickness: 160 microns at a nominal basis weight of 85 g/m squared.
- Color: white.
- Sterility: nonsterile.
The acid-hardened surface allows precipitates to be scraped from the paper for recovery, supporting accurate gravimetric determination. With high wet strength and a uniform retention profile, this medium maintains sample integrity across critical analytical filtration operations, including vacuum-assisted filtration in Buchner funnels.
- Color
- White
- Diameter
- 185mm
- Flow Speed
- Medium (Herzberg filtration speed 200 s)
- Grade
- Quantitative, Hardened Ashless, Grade 540
- Hardened (Yes/ No)
- Yes
- Material
- Cellulose (cotton linters)
- Nominal Ash Content (%)
- 0.006
- Nominal Basis Weight (g/ m²)
- 85
- Nominal Thickness (µm)
- 160
- Pack Count
- 100
- Particle Retention
- 8 µm nominal
- Pore Size (µm)
- 7.0-12.0
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- 1540-185
- Gravimetric Metal Analysis Serves as a gravimetric filter during analysis of metals in acidic or alkaline solutions and in the collection of hydroxides after precipitation by strong alkalis.
- Quantitative Precipitate Recovery The hardened, acid-treated surface lets analysts scrape retained precipitates from the paper for accurate quantitative determination.
- Strongly Acidic or Alkaline Sample Filtration High chemical resistance and wet strength make it well suited to filtering aggressive acid and alkali suspensions.
- Buchner Funnel Vacuum Filtration High wet strength supports vacuum-assisted filtration of difficult coarse or gelatinous precipitates in Buchner or three-piece funnels.
- General Analytical Laboratory Filtration The 8 micron medium retention and medium flow rate suit a wide range of routine critical analytical filtration operations.
- Low-Contamination Gravimetric Work The 0.006% maximum ash content minimizes contaminant contribution where weighing accuracy is essential.