Whatman
Grade 113 Qualitative Filter Paper Wet-Strengthened, 185mm Circle, 100/Pk SKU: 1113-185

Qualitative Filter Paper - 1113-185

Gravity filtration setups require paper that wets uniformly, seats flat in funnels, and retains particles at the rated threshold. Smooth surface finish allows clear visual assessment of retained solids and supports clean separation of precipitates from filtrate. For this reason, lot-level verification of retention, thickness, and ash content ensures predictable performance when scaling from method development to routine analysis.

Key Filter Paper Characteristics

• Standard cellulose construction eliminates chemical treatment steps that could introduce background contamination in sensitive analytical methods.
• Rated at 30um particle retention, the fiber matrix provides a defined cutoff for consistent separation across analytical batches.
• Wet-strengthened fiber matrix withstands extended contact with aqueous solutions without the disintegration that limits untreated papers.
• Smooth surface finish supports clear visual inspection of retained material and clean separation from the collected filtrate.
• Medium porosity cellulose matrix captures suspended solids while maintaining the throughput needed for efficient batch processing.

If your laboratory runs standardized filtration protocols, the lot-level consistency of this filter paper protects your method reproducibility. With this in mind, cotton linter cellulose provides the clean fiber background your general analytical methods need without the cost of specialty grades. Elevate the quality of your analytical data today by standardizing on a filtration product built to meet the exact specifications of your applications.

Diameter

185mm

Flow Speed

Fast

Folded/ Fluted/ Pleated

No

Grade

113

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Basis Weight (g/ m²)

125g/m²

Particle Retention

30um

Pore Size (µm)

30

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

Yes

Wettability

Hydrophilic

• Botanical Extraction - Separates plant tissue debris from aqueous and solvent extracts during natural product preparation workflows.
• Pigment Screening - Separates undispersed colorant particles from coating formulations during color development and QC testing.
• Lysate Clarification - Separates cellular debris from crude lysates before downstream chromatographic or electrophoretic analysis.
• 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.
• Teaching Laboratory - Provides consistent and economical filtration media for student exercises in analytical and general chemistry.