Grade 4 Qualitative Filter Paper, Standard, 240mm Circle, 100/Pk SKU: 1004-240

Qualitative Filter Paper - 1004-240

Teaching laboratories introducing filtration techniques need a paper grade that produces reliable results while remaining cost-effective for student use. Available in circles, sheets, and prefolded formats to match specific funnel geometries and sample processing workflows. Each sheet reflects production standards where fiber density, thickness, and retention characteristics are verified before lot release.

Key Filter Paper Characteristics

• Standard cellulose construction eliminates chemical treatment steps that could introduce background contamination in sensitive analytical methods.
• Available in precut circles and sheet stock to match funnel sizes and custom cutting requirements across laboratory applications.
• Uniform fiber distribution across the sheet ensures consistent particle retention from edge to center for reproducible filtration results.
• At 8um rated retention, the fiber matrix captures particles above the threshold while allowing smaller materials to pass through.
• Smooth surface finish supports clear visual inspection of retained material and clean separation from the collected filtrate.

If your laboratory runs standardized filtration protocols, the lot-level consistency of this filter paper protects your method reproducibility. Addressing this directly, consistent sheet-to-sheet performance reduces the variability your operators encounter during high-volume daily filtration workflows. 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

240mm

Flow Speed

Medium

Folded/ Fluted/ Pleated

No

Grade

2

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Ash Content (%)

0.06%

Nominal Basis Weight (g/ m²)

97g/m²

Particle Retention

8um

Pore Size (µm)

20.0-25.0

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Lysate Clarification - Separates cellular debris from crude lysates before downstream chromatographic or electrophoretic analysis.
• Precipitation Recovery - Collects insoluble reaction products on the paper surface for subsequent washing and downstream analysis.
• 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.
• Enzyme Clarification - Removes particulates from enzyme solutions before activity assays in biochemistry and industrial testing.
• Pigment Screening - Separates undispersed colorant particles from coating formulations during color development and QC testing.