Filter Paper
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Filter Paper
Qualitative and quantitative filter papers for the clarification and purification of samples for analysis. Available in a range of sizes, counts, grades, and formats such as circles and sheets, they are often made from cellulose or nylon.
Filter papers are familiar laboratory consumables often used with a conical funnel or similar device to filter and retain solids, particulates, and other materials from aqueous solutions, suspensions, solvents, and other liquids. Filter papers may be manufactured from natural cellulose, nylon, or glass or quartz fibers. They are typically available as pre-cut circles of various diameters, which may be folded into pleats, quadrants, or pyramids. Some filter papers are also sold as sheets or rolls that can be cut to size as needed.
Filter papers may be categorized as qualitative or quantitative. Qualitative filter papers are used for general purpose filtration applications where subsequent analysis is not critical. Quantitative filter papers (ashless papers) are intended for more exacting analytical work and may be weighed or otherwise processed after use. They are made from low-linting fibers that are typically acid-hardened during their manufacture to provide high wet strength and chemical resistance, and are pre-rinsed with demineralized water for extra purity.
Most filter papers are also graded numerically according to pore size, which in turn infers other parameters such as flow rate, retention, thickness, weight, and burst strength, that constrain and prescribe their application.
What is Filter Paper Used for?
• General applications: research laboratories, clinics, and educational settings
• Analytical applications: precipitant and particulate removal prior to further analysis or assay
• Industrial applications: foods and beverages, cosmetics, and gravimetric analysis of cements, clays, and iron and steel products
• Environmental applications: water, soil, or atmospheric sample analysis
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Filtered Search Results
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Fisherbrand™ Grade 601 General Purpose Filter Papers
A filter paper used in analytical works in laboratories with medium filtration velocity.
Thickness (Metric) | 0.16 mm |
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Pore Size | 5 to 13 μm |
Format | Disc |
Quantity | 100/Pk. |
For Use With (Application) | General works, hospitals, research laboratories, schools, chemical industries, cosmetics, food and beverage industries |
Fisherbrand™ Grade 600 Cellulose General Purpose Filter Paper
Used in schools and as bench protective paper. Fisherbrand™ Grade 600 Cellulose General Purpose Filter Paper is economical.
Fisherbrand™ Grade 602 Medium Filtering Special Filter Paper
Suitable for all works in laboratories. Fisherbrand™ 602 Medium Filtering Special Filter Paper is used in filtration of various products, pharmaceutical wrapping (pills, powders, dressing bandages and tablets).
Length (Metric) | 520 mm |
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Grade | 602 |
For Use With (Application) | All works in laboratories - filtration of various products, pharmaceutical wrapping (pills, powders , dressing bandages and tablets) |
Width (Metric) | 420 mm |
Dimensions (L x W) | 520 x 420mm |
Thermo Scientific™ Western Blotting Filter Papers, 0.83 mm thick, 8 x 10.5 cm
Pre-cut cotton sheets for wet or semi-dry, passive or electrophoretic transfer of proteins from polyacrylamide gels to PVDF, nitrocellulose, or other membranes.
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Cytiva Whatman™ Grade 597 Qualitative Filter Circles
Filters carbon dioxide and turbidity during beverage analysis. Whatman™ Grade 597 Qualitative Filter Circles may also be used to determine fat content in food analysis.
Thickness (Metric) | 180 μm |
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Pore Size | 4 to 7 μm |
Flow Rate | Medium Fast |
Particle Retention | 7 μm |
Format | Disc |
Grade | Grade 597 |
Material | Cellulose |
Filtration Speed | Approx. 140 s |
For Use With (Application) | A standard grade filter used for a wide variety of analytical routine applications in different industries like food testing (e.g., determination of fat content) or removal of carbon dioxide and turbidity from beverages (e.g., beer analysis). |
Cytiva Whatman™ Grade 44 Quantitative Filter Paper
Reduces overall ash content and the amount of time required for filtration. Whatman™ Grade 44 Quantitative Filter Paper provides faster gravimetric analysis with filter thinner material.
Thickness (Metric) | 176 μm |
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Pore Size | 3 μm |
Flow Rate | Medium |
Particle Retention | 3 μm |
Type | Ashless |
Format | Disc |
Airflow Rate | 56 s/100 mL/in2 |
Quantity | 100 Pack |
Grade | Grade 44 |
Material | Cotton Linters |
Porosity | Fine |
Filtration Speed | 995 sec. |
Thermo Scientific™ Western Blotting Filter Paper, Extra Thick, 20 cm x 20 cm
Pre-cut cotton sheets for wet or semi-dry, passive or electrophoretic transfer of proteins from polyacrylamide gels to PVDF, nitrocellulose, or other membranes.
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Cytiva Whatman™ Qualitative Filter Paper: Grade 2 Sheets
Retains and absorbs more than Grade 1 filters, with a corresponding increase in filtration time. Whatman™ Qualitative Filter Paper: Grade 2 Sheets are used for monitoring specific contaminants in the atmosphere and in soil testing.
Thickness (Metric) | 190 μm |
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Flow Rate | Medium |
Particle Retention | >8 μm |
Format | Sheet |
Quantity | 100/Pk. |
Grade | Grade 2 |
Material | Cellulose |
Porosity | Medium Fine |
Filtration Speed | 240 sec. |
For Use With (Application) | A standard grade filter used for monitoring specific contaminants in the atmosphere and in soil testing. |
Cytiva Whatman™ Kjeldahl Analysis Weighing Paper, Grade B-2
Dissolves residue-free in acid solution, which is critical in applications such as Kjeldahl analysis of nitrogen in soil. Whatman Kjeldahl Analysis Weighing Paper, Grade B-2 is thin, lightweight, and low in nitrogen for accurate chemical analysis.
Thickness (Metric) | 0.04 mm |
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Type | Parchment Paper |
Format | Sheet |
Quantity | 500 Pack |
Grade | B-2 |
Material | Parchment Paper |
Cytiva Whatman™ Glass Microfiber Filter Paper Grade 6
Captures tiny particles without becoming weak. Whatman™ Glass Microfiber Filter Paper Grade 6 may also be used for determination of filterable substances and residue upon ignition or analysis of aggressive media.
Thickness (Metric) | 350 μm |
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Flow Rate | Slow |
Particle Retention | <1 μm |
Grade | GF 6 |
Material | Borosilicate Glass |
Filtration Speed | 40 s/100mL/in2 |
Cytiva Whatman™ Cellulose Nitrate Membrane Filters
Manufactured under strictly controlled conditions. Whatman™ Cellulose Nitrate Membrane Filters have a noticeably improved flexibility and are made to tolerate abuse during handling, loading, and autoclaving without sacrificing integrity.
Thickness (Metric) | 105 to 140 μm |
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Format | Disc |
Quantity | 100 Pack |
Material | Cellulose Nitrate |
Fisherbrand™ Grade 14 Ashless Slowly Filtering Quantitative Filter Paper
Used for fine precipitates such as lead dioxide, calcium fluoride.
Thickness (Metric) | 0.15 mm |
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Pore Size | 3 to 5 μm |
Particle Retention | 3 to 5 μm |
Type | Ashless Quantitative Filter Paper |
Format | Disc |
Description | Ash Content: 0.007% |
Quantity | 100/Pk. |
Material | Cotton Linters |
Filtration Speed | 100 sec. |
Fisherbrand™ Grade 122 General Purpose Filter Papers
A general purpose filter paper used for all general works in the laboratory for excellent and consistent filtration.
Sartorius Qualitative Filter Papers
These Qualitative Filter Papers are made with refined pulp and cotton linters with more than 95% alpha-cellulose content, and have an ash content of less than 0.1%, perfect for qualitative analysis.
Sartorius Smooth Technical Filter Papers
This Smooth Technical Filter Paper grade is generally used for analytical and technical purposes.
Type | Smooth Filter Paper |
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Material (Membrane) | Cellulose |
Material | Cotton Linters, Refined Pulp |
Fit for Purpose | Certified Quality |