Grade 4 Qualitative Filter Paper, Standard, 70mm Circle, 100/Pk SKU: 1004-070

Qualitative Filter Paper - 1004-070

Routine laboratory filtration demands a filter paper that delivers consistent particle retention without slowing sample throughput. Smooth surface finish allows clear visual assessment of retained solids and supports clean separation of precipitates from filtrate. Altogether, from fiber selection through final inspection, the manufacturing process ensures every sheet meets the performance specifications of its grade.

Key Filter Paper Characteristics

• Manufactured from high-purity cotton linters, qualitative filter paper provides a clean filtration surface with minimal fiber shedding.
• Wet strength sufficient for gentle handling during precipitate transfer while maintaining the rapid flow rates of qualitative grades.
• Nominal basis weight of 92g/m² reflects the fiber density that determines flow rate, retention, and mechanical handling characteristics.
• Controlled ash level of 0.06% meets the blank value requirements of quantitative methods where filter contribution must be documented.
• At 25um rated retention, the fiber matrix captures particles above the threshold while allowing smaller materials to pass through.

Maintaining accreditation requires documented traceability at every step, and the grade specifications above support your audit readiness. 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

70mm

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

• 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.
• Soil Extract Filtration - Clarifies soil slurries for nutrient and pH testing, removing fine particles that interfere with analysis.
• Paint and Coatings QC - Removes gels and undispersed pigment from coating samples prior to color measurement and viscosity testing.
• 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.