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Thumbnail Filmstrip of Quantitative Filter Paper, Grade 41, 20-25um, 70mm, Fast Flow, Ashless, 100/Pk Images
Featuring an ashless cellulose medium refined for high-purity gravimetric work, these 70mm Grade 41 quantitative filter paper discs deliver a fast flow rate with a coarse 20-25 micron nominal particle retention. The 190 micron thick paper is engineered for analytical procedures involving large particles or gelatinous precipitates, providing rapid filtration while maintaining the low ash content required for accurate quantitative analysis. Each box contains 100 discs.
Key Cellulose Media Characteristics
- Ashless purity: Low ash residue after ignition supports accurate gravimetric and quantitative determinations.
- Coarse 20-25 micron retention: Nominal particle retention suited to large particulates and gelatinous precipitates such as iron or aluminum hydroxides.
- Fast flow rate: Among the fastest in the quantitative ashless range, supporting high-throughput filtration.
- Hydrophilic structure: Naturally wettable cellulose matrix for consistent aqueous filtration.
- 190 micron thickness: Provides handling strength and solute loading capacity for routine analytical use.
Key Construction Characteristics
- Material: Ashless cellulose, quantitative grade.
- Format: 70mm diameter circular discs.
- Wet bursting strength: 40 kPa.
- Packaging: Nonsterile, 100 discs per box.
These discs maintain consistent retention and flow characteristics across the box, supporting reproducible gravimetric results. The ashless cellulose construction preserves sample integrity by minimizing residual ash that could interfere with downstream weighing or analysis. Reliable performance makes them well suited to soil, air pollution, and coarse precipitate workflows.
- Burst Pressure (psi)
- 40 kPa
- Color
- White
- Diameter
- 70mm
- Flow Speed
- Fast
- Grade
- Quantitative
- Hardened (Yes/ No)
- No
- Material
- Cellulose
- Membrane Thickness (µm)
- 190
- Nominal Basis Weight (g/ m²)
- 80
- Nominal Thickness (µm)
- 190
- Pack Count
- 100
- Particle Retention
- 20-25
- Pore Size (µm)
- 20-25
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 41
- Gravimetric Analysis The low ash content supports accurate weighing of coarse precipitates such as iron and aluminum hydroxides.
- Coarse Particle Filtration The 20-25 micron retention and fast flow rate clarify samples containing large particles or gelatinous precipitates.
- Air Pollution Monitoring Fast flow makes the paper suitable for impregnation and determination of gaseous compounds at high flow rates.
- Environmental Sample Prep Useful for preparing solid samples such as soils and sludges following acid digestion for metals analysis.
- Pressure and Vacuum Filtration Suitable for Buchner funnel and pressure filtration of heavily loaded aqueous samples.
- Routine Analytical Filtration Provides high-throughput clarification where coarse retention is acceptable and speed is a priority.