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Thumbnail Filmstrip of Qualitative Filter Paper, Grade 04, 20um Retention, 125mm, Nonsterile, 100/Pk Images
Featuring a hydrophilic cellulose depth medium with an extra fast flow rate, these Grade 04 qualitative filter paper circles deliver rapid filtration of coarse and gelatinous precipitates. Each disc measures 125mm in diameter with a 20um nominal particle retention, making it well suited to routine separations where fine particle collection is not critical. The papers are supplied nonsterile in convenient packs of 100.
Key Filter Paper Media Characteristics
- Hydrophilic cellulose medium that wets quickly with aqueous samples for fast, even filtration.
- 20um nominal particle retention captures coarse particles and gelatinous precipitates such as iron hydroxide and aluminum hydroxide.
- Extra fast flow rate minimizes filtration time for high-throughput routine work.
- High loading capacity handles heavily laden samples and coarse sediments.
- Qualitative grade intended for separations where residue mass is not measured gravimetrically.
Key Construction Characteristics
- Circular disc format, 125mm diameter, for use in standard funnels.
- Cellulose construction compatible with typical aqueous and many organic samples.
- Supplied nonsterile.
- Packaged 100 discs per pack.
This Grade 04 paper provides dependable, repeatable clarification across everyday laboratory workflows. Its fast flow and high loading capacity protect downstream steps from coarse particulates while maintaining sample integrity. The qualitative grade is the practical choice for general-purpose filtration where speed and throughput matter most.
- Color
- White
- Diameter
- 125mm
- Flow Speed
- Extra Fast
- Grade
- Grade 04 (Qualitative)
- Material
- Cellulose
- Mesh Format
- Circle
- Pack Count
- 100
- Particle Retention
- 20um
- Pore Size (µm)
- 20
- Qualitative/ Quantitative
- Qualitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Whatman Grade 4
- Coarse Precipitate Filtration Captures coarse and gelatinous precipitates such as iron, aluminum, and chromium hydroxides during qualitative analysis.
- Biological Fluid Cleanup Provides rapid routine clean-up of biological fluids and organic extracts prior to downstream analysis.
- Sample Clarification Clarifies cloudy liquids quickly thanks to its extra fast flow rate and high loading capacity.
- Food Analysis Separates solid foodstuffs from associated liquids in routine food testing procedures.
- Air Pollution Monitoring Suited to air monitoring applications where the collection of fine particles is not critical.
- Prefiltration Removes coarse particulates and sediment to protect finer downstream filters from premature clogging.