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Thumbnail Filmstrip of Qualitative Filter Paper Discs, Grade 04, 20um Retention, 42mm, Extra Fast, 100/Pk Images
Featuring a refined cellulose matrix made from pure cotton linters with a near 100% alpha-cellulose content, these Grade 04 qualitative filter paper discs deliver extremely fast filtration for routine laboratory work. Each disc measures 42mm in diameter with a nominal particle retention of 20um, making this paper one of the fastest in the qualitative range and well suited to handling coarse particles and gelatinous precipitates. The hydrophilic medium wets readily with aqueous samples and provides high flow with excellent loading capacity.
Key Filter Paper Media Characteristics
- Nominal particle retention of 20um for rapid capture of coarse particles and gelatinous precipitates such as iron and aluminium hydroxide.
- Extra fast (very fast) flow rate, the fastest speed in the qualitative range, for high-throughput routine filtration.
- Hydrophilic cellulose construction made from refined pulp and pure cotton linters with nearly 100% alpha-cellulose content.
- Low ash content of less than 0.06%, supporting clean qualitative results.
- High loading capacity ideal for samples carrying heavy particulate burdens.
Key Construction Characteristics
- Material: qualitative cellulose filter paper, Grade 04.
- Disc diameter: 42mm circles.
- Sterility: nonsterile.
- Packaging: 100 discs per pack.
This paper provides consistent, reproducible filtration when speed and high particulate loading are the priority and the collection of fine particles is not critical. It performs reliably in routine clean-up of biological fluids and organic extracts, helping maintain sample integrity through dependable clarification.
- Color
- White
- Diameter
- 42mm
- Flow Speed
- Extra Fast
- Grade
- Grade 04
- Material
- Filter Paper
- Nominal Ash Content (%)
- <0.06
- Pack Count
- 100
- Particle Retention
- 20um
- Pore Size (µm)
- 20
- Qualitative/ Quantitative
- Qualitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 4
- Routine Sample Clarification Quickly clarifies liquids in everyday laboratory workflows where high flow is required and fine particle collection is not critical.
- Coarse Precipitate Filtration Captures coarse particles and gelatinous precipitates such as iron, aluminium, and chromium hydroxide.
- Biological Fluid Clean-Up Provides rapid routine clean-up of biological fluids and organic extracts during analysis.
- Air Pollution Monitoring Supports monitoring of air pollution where high flow rates are needed and the collection of fine particles is not essential.
- Food Analysis Serves general food industry filtration tasks requiring fast, high-capacity paper.
- Silica Determination Used in silica determination during steel and iron analysis.