Whatman
Grade 4 Qualitative Filter Paper, Standard, 38x114mm Roll, 1 Pk SKU: 1004-648

Qualitative Filter Paper - 1004-648

General clarification and sample preparation workflows require a cellulose filter paper with predictable performance across varying sample types. Pure cotton linter cellulose provides a uniform fiber matrix with consistent porosity and predictable retention across standard grade designations. Working in concert, from fiber selection through final inspection, the manufacturing process ensures every sheet meets the performance specifications of its grade.

Key Filter Paper Characteristics

• Standard cellulose construction eliminates chemical treatment steps that could introduce background contamination in sensitive analytical methods.
• Smooth surface finish supports clear visual inspection of retained material and clean separation from the collected filtrate.
• Wet strength sufficient for gentle handling during precipitate transfer while maintaining the rapid flow rates of qualitative grades.
• Standard qualitative cellulose filter paper provides reliable particle retention for gravity and vacuum filtration across routine laboratory workflows.
• Medium porosity cellulose matrix captures suspended solids while maintaining the throughput needed for efficient batch processing.

Maintaining accreditation requires documented traceability at every step, and the grade specifications above support your audit readiness. Cotton linter cellulose provides the clean fiber background your general analytical methods need without the cost of specialty grades. Secure your research outcomes by partnering with a filtration solution that understands your need for speed, accuracy, and reproducibility.

Dimensions

38mm x 30m

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

Particle Retention

25um

Pore Size (µm)

20.0-25.0

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Pigment Screening - Separates undispersed colorant particles from coating formulations during color development and QC testing.
• Paint and Coatings QC - Removes gels and undispersed pigment from coating samples prior to color measurement and viscosity testing.
• Soil Extract Filtration - Clarifies soil slurries for nutrient and pH testing, removing fine particles that interfere with analysis.
• Botanical Extraction - Separates plant tissue debris from aqueous and solvent extracts during natural product preparation workflows.
• Gelatin Clarification - Removes debris from gelatin solutions used in pharmaceutical capsule manufacturing and quality testing.
• Beverage Testing - Filters wine, beer, and juice samples before clarity and color measurements in food quality control laboratories.