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Thumbnail Filmstrip of Hardened Ashless Quantitative Filter Paper, Grade 540, 8um, 42.5mm Circles, 100/Pk Images
Featuring an acid-hardened, high-purity cellulose medium made from quality cotton linters, this Grade 540 (DF540) quantitative filter paper delivers medium retention and a medium flow rate for critical analytical filtration. The 42.5mm circles provide a nominal particle retention of 8 microns and an extremely low ash content, making them well suited for quantitative and gravimetric analysis of strongly acidic or alkaline samples. The acid-treated surface provides high wet strength that resists tearing and allows precipitates to be scraped from the paper for recovery.
Key Filter Paper Media Characteristics
- Hardened ashless cellulose construction made from high-quality cotton linters with a minimum alpha-cellulose content of 98 percent
- Nominal particle retention of 8 microns with a medium flow rate (Herzberg filtration speed of 200 seconds)
- Acid-hardened surface delivers high wet strength and high chemical resistance to strong acid and alkali suspensions
- Extremely low nominal ash content for trace-level gravimetric work with minimal contaminant introduction
- Nominal thickness of 160 microns and a nominal basis weight of 85 g/m2
Key Construction Characteristics
- Circle format, 42.5mm diameter, white
- Quantitative, hardened, ashless grade for general laboratory use
- Nonsterile, supplied 100 per pack
This grade maintains sample integrity during demanding gravimetric procedures, withstanding strong acid and alkali solutions without breakdown. The hardened surface provides reliable, repeatable retention while permitting clean recovery of retained precipitates. Each disc supports accurate quantitative results across a wide range of critical analytical filtration operations.
- Color
- White
- Diameter
- 42.5mm
- Flow Speed
- Medium
- Grade
- DF540 (Grade 540)
- Hardened (Yes/ No)
- Yes
- Material
- Filter Paper
- Mesh Format
- Circle
- Nominal Basis Weight (g/ m²)
- 85
- Nominal Thickness (µm)
- 160
- Pack Count
- 100
- Particle Retention
- 8 um
- Pore Size (µm)
- 8.0
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- 1540-042 (Grade 540)
- Gravimetric Analysis Frequently used as a gravimetric filter during analysis of metals in acidic or alkaline solutions due to its hardened, ashless construction.
- Hydroxide Collection Suited to collecting hydroxides after precipitation by strong alkalis, where high wet strength and chemical resistance are required.
- Medium Precipitate Filtration Recommended for filtering medium-sized precipitates such as most metal sulphides at a medium flow rate.
- Strong Acid and Alkali Filtration High chemical resistance allows filtration of strongly acidic or alkaline samples without tearing or breakdown.
- Precipitate Recovery The acid-treated hard surface allows the analyst to scrape and recover precipitates retained on the paper.
- Critical Analytical Filtration Extremely low ash content and high purity support quantitative analytical operations where contaminant introduction must be minimized.