Qualitative Filter Paper product photo 1

Lab Filtration Products

Qualitative Filter Paper

Qualitative filter paper is made from 100% alpha cotton cellulose with an ash content of 0.1%. It is stable across pH 0 to 12 and thermally stable up to 120°C. Available in fast, middle, and slow speed grades, with diameters from 7 cm to 18 cm and sheet sizes of 600 mm × 600 mm, it supports general laboratory filtration, liquid clarification, analytical separations, and rough sample preparation. The folded design increases flow rate and load capacity compared to standard flat sheets.

100% alpha cotton cellulose with 0.1% ash content ensures low contamination for analytical work
Stable from pH 0 to 12 and thermally stable up to 120°C for use in aggressive chemical and high-temperature applications
Three speed grades-fast, middle, and slow-allow selection based on particle size and flow rate needs
Folded structure increases flow rate and load capacity compared to standard flat filter paper

Key Benefits

What This Product Gives You

100% alpha cotton cellulose with 0.1% ash content ensures low contamination for analytical work
Stable from pH 0 to 12 and thermally stable up to 120°C for use in aggressive chemical and high-temperature applications
Three speed grades-fast, middle, and slow-allow selection based on particle size and flow rate needs
Folded structure increases flow rate and load capacity compared to standard flat filter paper
Available in 7 cm to 18 cm diameters and 600 mm × 600 mm sheets to suit bench-scale and larger filtration tasks

Made from 100% alpha cotton cellulose with ash content of 0.1%
Stable across pH 0 to 12 and thermally stable up to 120°C
Available in three flow speed grades: fast, middle, and slow
Filtration speed ranges: fast (20-25 μm), middle (8-16 μm), slow (2-8 μm)
Retention capacity: fast (≤35 μm), middle (35-70 μm), slow (35-70 μm)
Diameter options: 7 mm, 9 mm, 11 mm, 12.5 mm, 15 mm, 18 mm
Sheet size: 600 mm × 600 mm for bulk use
Weight: 80 g/m² (±4%)
Folded design increases flow rate and load capacity
Supplied in 100 pieces per pack

Where It Is Used

Applications And Buyers

Application Scenarios

Clarifying liquid samples before chemical analysis in pharmaceutical QC labs
Performing analytical separations in environmental testing where low extractables are required
Filtering solvents and reagents in chemical plants during process development
Preparing rough samples for further analysis in food and beverage testing
Using in air and water analysis where consistent filtration performance is needed

Who It Is For

Pharmaceutical and chemical laboratories conducting qualitative analysis and method development
Environmental testing labs handling water and air samples requiring stable, low-ash filters
R&D teams in industrial plants needing reliable filtration for solvent and reagent preparation
Laboratory distributors sourcing standard filter paper with consistent performance across grades
Contract labs requiring a stable, non-reactive filter for routine sample preparation

Problems It Solves

Contamination from inorganic residues in filters showing up in analytical results
Filter clogging due to low load capacity in standard flat sheets during high-volume filtration
Inconsistent flow rates when using non-standardized filter paper with variable pore retention
Chemical instability in filters when exposed to extreme pH or high temperatures
Lack of standardization in filter speed and retention when switching between suppliers

Data

Specifications

Material	100% alpha cotton cellulose
Ash Content	0.1%
pH Stability	0 to 12
Thermal Stability	Up to 120°C
Speed Grade	Fast, Middle, Slow
Filtration Speed	Fast: 20-25 μm, Middle: 8-16 μm, Slow: 2-8 μm
Retention Capacity	Fast: ≤35 μm, Middle: 35-70 μm, Slow: 35-70 μm
Diameter	7 mm, 9 mm, 11 mm, 12.5 mm, 15 mm, 18 mm
Sheet Size	600 mm × 600 mm
Weight	80 g/m² (±4%)
Packing	100 pieces per pack
Folded Design	Yes

Materials

100% alpha cotton cellulose
No synthetic additives or resins

Customization Options

Available in three speed grades: fast, middle, slow
Diameter options from 7 mm to 18 mm
Sheet size of 600 mm × 600 mm for bulk use
OEM private-label packing available through the Microlab OEM division
Custom packaging configurations can be arranged upon request

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Raw alpha cotton cellulose is processed into filter paper stock
Paper is formed with controlled thickness and weight (80 g/m² ±4%)
Speed grades are determined during formation to achieve specified flow rates
Paper is folded to increase flow rate and load capacity
Cut to diameter or sheet size as per order
Packed in 100 pieces per pack

Quality Control

Ash content tested to ensure 0.1% maximum
pH and thermal stability verified through standard testing
Speed grade and retention capacity confirmed against specification
Visual inspection for tears, holes, and uniformity before packing
Packing quantity verified to 100 pieces per pack

Comparison

Compared With The Alternatives

Versus Synthetic membrane filters

Qualitative filter paper is non-reactive and low-ash, making it suitable for qualitative analysis where membrane extractables could interfere. Synthetic filters may introduce organic residues.

Versus Standard flat filter paper

The folded design increases flow rate and load capacity, reducing clogging during high-volume or particle-laden filtration compared to flat sheets.

Versus High-ash filter paper

With 0.1% ash content, this paper reduces inorganic contamination in analytical results, unlike higher-ash grades used in industrial processes.

Versus Reusable filter media

Single-use filter paper avoids carry-over and cleaning validation, which is critical in regulated environments where contamination control is essential.

Use Guide

How To Use It

Select speed grade based on particle size: fast for large particles, slow for fine particles
Use fast speed for high-volume liquid clarification where speed is critical
Choose middle speed for balanced flow and retention in routine lab work
Use slow speed for fine particulates or when high retention is required
Ensure the filter is dry and free of tears before use
Fold the paper properly to maintain structural integrity during filtration
Discard after single use to avoid cross-contamination
Store in a dry, clean environment to prevent moisture absorption and degradation

Photos

Product Gallery

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FAQ

Questions Buyers Ask

What is the ash content of the filter paper?

The ash content is 0.1%, which ensures low inorganic contamination for analytical applications.

Is the filter paper stable at high temperatures?

Yes, it is thermally stable up to 120°C, making it suitable for hot filtration or sterilization processes.

What are the three speed grades and when should I use them?

Fast (20-25 μm) for large particles and high flow, middle (8-16 μm) for general use, slow (2-8 μm) for fine particles and high retention.

Can I use this filter paper for pH extremes?

Yes, it is stable from pH 0 to 12, suitable for both acidic and alkaline solutions.

How is the paper packaged?

Standard packing is 100 pieces per pack, with diameters from 7 mm to 18 mm or 600 mm × 600 mm sheets.

Do you offer private-label packaging?

Yes, the Microlab OEM division supports private-label packing and custom packaging configurations.