Whatman
Grade 4 Qualitative Filter Paper, Standard, 110mm Circle, 100/Pk SKU: 1004-110

Qualitative Filter Paper - 1004-110

Routine laboratory filtration demands a filter paper that delivers consistent particle retention without slowing sample throughput. Natural cellulose wettability eliminates the pre-wetting step required by hydrophobic membranes in aqueous sample filtration. From fiber selection through final inspection, the manufacturing process ensures every sheet meets the performance specifications of its grade.

Key Filter Paper Characteristics

• Available in precut circles and sheet stock to match funnel sizes and custom cutting requirements across laboratory applications.
• Pure cellulose fiber construction delivers consistent flow rates and predictable retention for general sample clarification and preparation.
• Standard qualitative cellulose filter paper provides reliable particle retention for gravity and vacuum filtration across routine laboratory workflows.
• At 25um rated retention, the fiber matrix captures particles above the threshold while allowing smaller materials to pass through.
• Standard wet strength is sufficient for conventional Buchner funnel and gravity filtration setups at moderate sample volumes.

Reporting filtration parameters alongside your analytical results demands documented grade, retention, and lot traceability for reviewer confidence. To address this, consistent sheet-to-sheet performance reduces the variability your operators encounter during high-volume daily filtration workflows. Elevate the quality of your analytical data today by standardizing on a filtration product built to meet the exact specifications of your applications.

Diameter

110mm

Flow Speed

Fast

Folded/ Fluted/ Pleated

No

Grade

4

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Ash Content (%)

0.06%

Nominal Basis Weight (g/ m²)

92g/m²

Pack Count

100

Particle Retention

25um

Pore Size (µm)

20.0-25.0

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Polymer Filtration - Clears particulates from polymer solutions before molecular weight determination by viscometry or GPC.
• Enzyme Clarification - Removes particulates from enzyme solutions before activity assays in biochemistry and industrial testing.
• Beverage Testing - Filters wine, beer, and juice samples before clarity and color measurements in food quality control laboratories.
• Pigment Screening - Separates undispersed colorant particles from coating formulations during color development and QC testing.
• General Clarification - Removes suspended solids from aqueous solutions by gravity filtration for routine sample preparation.
• Teaching Laboratory - Provides consistent and economical filtration media for student exercises in analytical and general chemistry.