Grade 4 Qualitative Filter Paper, Standard, 400mm Circle, 100/Pk SKU: 1004-400

Qualitative Filter Paper - 1004-400

Laboratories processing dozens of samples daily need a qualitative filter paper that performs reliably from the first sheet to the last. Available in circles, sheets, and prefolded formats to match specific funnel geometries and sample processing workflows. Controlled manufacturing delivers the documented retention, flow rate, and physical consistency that analytical and preparative filtration methods require.

Key Filter Paper Characteristics

• Pure cellulose fiber construction delivers consistent flow rates and predictable retention for general sample clarification and preparation.
• Standard cellulose construction eliminates chemical treatment steps that could introduce background contamination in sensitive analytical methods.
• Manufactured to a basis weight of 92g/m², each sheet delivers the documented mass consistency that gravimetric methods require.
• Compatible with standard glass and plastic filter funnels, qualitative paper integrates into existing gravity filtration setups without modification.
• Wet strength sufficient for gentle handling during precipitate transfer while maintaining the rapid flow rates of qualitative grades.

When your application makes the filter paper part of the measurement, the ash and weight specifications above define its analytical contribution. Economical unit cost at the pack quantities routine laboratories consume keeps your filtration budget aligned with actual throughput demands. Secure your research outcomes by partnering with a filtration solution that understands your need for speed, accuracy, and reproducibility.

Diameter

400mm

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

• Precipitation Recovery - Collects insoluble reaction products on the paper surface for subsequent washing and downstream analysis.
• Paint and Coatings QC - Removes gels and undispersed pigment from coating samples prior to color measurement and viscosity testing.
• Pigment Screening - Separates undispersed colorant particles from coating formulations during color development and QC testing.
• 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.
• Polymer Filtration - Clears particulates from polymer solutions before molecular weight determination by viscometry or GPC.