Whatman
Grade 1 Qualitative Filter Paper, Standard, 25mm Circle, 400 pack SKU: 1001-025

Qualitative Filter Paper - 1001-025

Separating precipitates from analytical solutions requires a cellulose matrix with the right balance of retention and flow rate. Controlled fiber density produces documented flow rate and retention characteristics that remain consistent across production lots. Each sheet reflects production standards where fiber density, thickness, and retention characteristics are verified before lot release.

Key Filter Paper Characteristics

• Medium porosity cellulose matrix captures suspended solids while maintaining the throughput needed for efficient batch processing.
• Available in precut circles and sheet stock to match funnel sizes and custom cutting requirements across laboratory applications.
• Standard basis weight and thickness specifications provide predictable packing density for volumetric calculations in gravity funnels.
• Particle retention rating of 11um defines the separation threshold for the application, determining which solids are captured and which pass through.
• Manufactured from high-purity cotton linters, qualitative filter paper provides a clean filtration surface with minimal fiber shedding.

Scaling your method from development to routine production requires paper consistency at every lot, and the specifications above provide that assurance. Standard cellulose chemistry eliminates the need for specialized disposal procedures your general laboratory filtration generates. Take control of your sample preparation variables and ensure that your data reflects the true nature of your work, rather than the quality of your consumables.

Diameter

25mm

Flow Speed

Medium

Folded/ Fluted/ Pleated

No

Grade

1

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Ash Content (%)

0.06%

Nominal Basis Weight (g/ m²)

87g/m²

Particle Retention

11um

Pore Size (µm)

11

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Botanical Extraction - Separates plant tissue debris from aqueous and solvent extracts during natural product preparation workflows.
• Beverage Testing - Filters wine, beer, and juice samples before clarity and color measurements in food quality control laboratories.
• Gelatin Clarification - Removes debris from gelatin solutions used in pharmaceutical capsule manufacturing and quality testing.
• Soil Extract Filtration - Clarifies soil slurries for nutrient and pH testing, removing fine particles that interfere with analysis.
• Enzyme Clarification - Removes particulates from enzyme solutions before activity assays in biochemistry and industrial testing.
• Lysate Clarification - Separates cellular debris from crude lysates before downstream chromatographic or electrophoretic analysis.