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Thumbnail Filmstrip of Qualitative Filter Paper, Grade 04, Extra Fast, 20um Retention, 55mm Circle, 100/Pk Images
Featuring a refined cellulose depth medium made from pure cotton linters with an alpha-cellulose content of nearly 100%, this Grade 04 qualitative filter paper delivers extra fast filtration with a nominal particle retention of 20um across a 55mm circle. The low ash content of less than 0.06% is not reduced by post-treatment, supporting clean routine separations. With a nominal thickness of 210um, the medium provides excellent retention of coarse particles and gelatinous precipitates while maintaining high flow.
Key Cellulose Media Characteristics
- Manufactured from refined pulp and pure cotton linters with an alpha-cellulose content of nearly 100% for consistent, diverse filtration properties.
- Extra fast filtration speed makes it well suited to coarse particles and gelatinous precipitates such as iron, aluminum, and chromium hydroxides.
- Low ash content of less than 0.06% that is not reduced by post-treatment, minimizing residual contamination.
- Nominal particle retention of 20um, ideal where high flow is required and the collection of fine particles is not critical.
- Naturally hydrophilic structure for ready wetting in aqueous gravity and light vacuum filtration.
Key Construction Characteristics
- Cellulose construction in a 55mm circle format compatible with standard glass and plastic filter funnels.
- Nominal thickness of 210um delivers structural integrity and particulate loading capacity.
- Nonsterile, supplied 100 discs per box.
This grade provides reliable, reproducible performance for coarse precipitate retention and routine clean-up of biological fluids or organic extracts. The uniform cellulose medium maintains consistent retention from edge to center, protecting sample integrity in clarification, food analysis, and air pollution monitoring workflows.
- Color
- White
- Diameter
- 55mm
- Flow Speed
- Extra Fast
- Grade
- Qualitative
- Material
- Cellulose
- Mesh Format
- Circle
- Nominal Ash Content (%)
- <0.06
- Nominal Thickness (µm)
- 210
- Pack Count
- 100
- Particle Retention
- 20um
- Pore Size (µm)
- 20
- Qualitative/ Quantitative
- Qualitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Coarse Precipitate Filtration Captures gelatinous precipitates such as iron hydroxide, aluminum hydroxide, and chromium hydroxide at high flow rates.
- Routine Biological Clean-Up Provides rapid clarification of biological fluids and organic extracts during analytical sample preparation.
- Air Pollution Monitoring Suitable for monitoring atmospheric particulates where collection of fine particles is not critical.
- Food Analysis Separates coarse solids from associated liquids in routine food testing procedures.
- Silica Determination Used in silica determination during steel and iron analysis where fast filtration is required.
- General Liquid Clarification Removes coarse particulates from cloudy suspensions for everyday laboratory clarification.