Whatman
Grade 1 Qualitative Filter Paper, Standard, 42.5mm Circle, 100/Pk SKU: 1001-042

Qualitative Filter Paper - 1001-042

Laboratories processing dozens of samples daily need a qualitative filter paper that performs reliably from the first sheet to the last. Cellulose fiber matrix maintains structural integrity through standard gravity and light vacuum filtration conditions. In practice, standardized manufacturing protocols produce papers with retention and flow characteristics that remain constant from the first batch to the last.

Key Filter Paper Characteristics

• Manufactured from high-purity cotton linters, qualitative filter paper provides a clean filtration surface with minimal fiber shedding.
• Standard cellulose construction eliminates chemical treatment steps that could introduce background contamination in sensitive analytical methods.
• Standard qualitative cellulose filter paper provides reliable particle retention for gravity and vacuum filtration across routine laboratory workflows.
• At 87g/m² nominal basis weight, the paper provides the mass uniformity needed for reproducible gravimetric determinations.
• Non-strengthened paper is appropriate for routine gravity filtration where prolonged vacuum exposure is not part of the workflow.

If your laboratory supports multiple research groups with varying filtration needs, this paper's broad applicability simplifies your procurement process. Addressing this directly, rapid wetting and uniform pore distribution reduce the setup time your operators spend preparing each filtration run. Take control of your sample preparation variables and ensure that your data reflects the true nature of your work, rather than the quality of your consumables.

Diameter

42.5mm

Flow Speed

Medium

Folded/ Fluted/ Pleated

No

Grade

1

Hardened (Yes/ No)

No

Material

Cellulose Fiber

Nominal Ash Content (%)

0.06%

Nominal Basis Weight (g/ m²)

87g/m²

Pack Count

100

Particle Retention

11um

Pore Size (µm)

11

Qualitative/ Quantitative

Qualitative

Sterility

Nonsterile

Wet Strengthened (Yes/ No)

No

Wettability

Hydrophilic

• Lysate Clarification - Separates cellular debris from crude lysates before downstream chromatographic or electrophoretic analysis.
• Soil Extract Filtration - Clarifies soil slurries for nutrient and pH testing, removing fine particles that interfere with analysis.
• Pigment Screening - Separates undispersed colorant particles from coating formulations during color development and QC testing.
• Teaching Laboratory - Provides consistent and economical filtration media for student exercises in analytical and general chemistry.
• Beverage Testing - Filters wine, beer, and juice samples before clarity and color measurements in food quality control laboratories.
• Polymer Filtration - Clears particulates from polymer solutions before molecular weight determination by viscometry or GPC.