Filter Paper
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
Fisherbrand™ Qualitative Filter Paper: Grade 6 Circles
Filters particles twice as fast as Qualitative Filter Paper Grade 5. Fisherbrand™ Qualitative Grade 6 Filters provide fine particle retention for boiler water analysis.
Promotions are available
Fisherbrand™ Quantitative Grade Filter Paper Circles
Manufactured to reduce silicon dioxide, calcium oxide and ferric oxide levels
Fisherbrand™ Qualitative Grade Plain Filter Paper Sheets - P8 Grade
Ideal for clarifying and removing particles of 1μm and larger, and in applications that do not require a low-ash or ashless paper
Fisherbrand™ Qualitative Grade Plain Filter Paper Circles and Sheets - P4 Grade
Ideal for clarifying and removing particles of 1μm and larger, and in applications that do not require a low-ash or ashless paper
Fisherbrand™ Qualitative Grade Plain Filter Paper Circles - P8 Grade
Ideal for clarifying and removing particles of 20μm and larger, and in applications that do not require a low-ash or ashless paper.
Thermo Scientific™ Western Blotting Filter Paper, 0.83 mm thick, 8 x 13.5 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.
Thermo Scientific™ Western Blotting Filter Paper, Extra Thick, 8 cm x 13.5 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.
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.
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.
Fisherbrand™ Qualitative Grade Plain Filter Paper Circles and Sheets - P2 Grade
Ideal for clarifying and removing particles of 1μm and larger, and in applications that do not require a low-ash or ashless paper
Fisherbrand™ Qualitative Grade Plain Filter Paper Circles - P5 Grade
Ideal for clarifying and removing particles of 1μm and larger, and in applications that do not require a low-ash or ashless paper
Fisherbrand™ Qualitative Grade Plain Filter Paper Sheets - P5 Grade
Ideal for clarifying and removing particles of 1μm and larger, and in applications that do not require a low-ash or ashless paper
Fisherbrand™ Wet-Strengthened Qualitative Filter Paper Circles
Coarse cellulose fiber papers remove particles >25μm
Fisherbrand™ Fluted Qualitative Filter Paper Circles
Cellulose fiber papers
Thermo Scientific™ Western Blotting Filter Paper, 0.83 mm thick, 7 x 8.4 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.
Thermo Scientific™ Western Blotting Filter Paper, Extra Thick, 7 cm x 8.4 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.
Thermo Scientific™ Western Blotting Filter Paper, Extra Thick, 8.5 cm x 9 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.
Cytiva Whatman™ Qualitative Grade Plain Circles - Grade 1
Cytiva Whatman Qualitative Grade Plain Circles - Grade 1, Diameter: 150 mm, for general-purpose use, air-pollution monitoring and soil chemical analysis
Promotions are available
Cytiva Whatman™ Grade 597 Optima Qualitative Filter Paper, Sheets
For a variety of routine applications in the food and beverage industries. Well-suited for the determination of fat content in food or removal of carbon dioxide and turbidity from beverages such as beer.
Promotions are available
Cytiva Whatman™ QM-C Quartz Filter Paper, Sheets
For heavy metal analysis of particulate matter and air quality monitoring
Cytiva Whatman™ Grade 597 Plus Qualitative Filter Paper, Circles
For a variety of routine applications in the food and beverage industries. Well-suited for the determination of fat content in food or removal of carbon dioxide and turbidity from beverages such as beer.
Promotions are available
Cytiva Grade 1573 Qualitative Filter Papers
A fast filter paper with high wet strength and a very smooth surface that simplifies the process of scraping or washing off precipitate.
Cytiva Whatman™ Grade 41 Fast Ashless Filter Paper
These environmental pollution papers are among the fastest filter papers in the Whatman™ ashless range. This gravimetric filter is well suited for quantitative analysis of soil and air.
Cytiva Whatman™ Grade 589/3 Ashless Filter Papers
Useful in capturing very fine particulate samples such as insoluble molecules in fats and oils, or supporting ash free dry mass
Cytiva Grade GF/A Filter for Personal Air Samplers
These aerosol sampling and particulate monitoring filters provide high flow rates and minimal sample interference. Cytiva Whatman Grade GF/A card-mounted filters are used in static sample and personal air sampler applications.
Cytiva Grade 740E Filter Discs
Meets FDA/WHO antibiotic-assay control disc standards. Whatman™ Grade 740E Filter Discs are thick, highly absorbent paper discs made of high-purity cotton linter for use in antibiotic-assay procedures.
Cytiva Whatman™ Grade 5 Qualitative Filter Papers
A standard grade clarifying filter excellent for cloudy suspensions or for water and soil analysis.
Cytiva Whatman™ Qualitative Filter Paper: Grade 597½ Pleated Circles
Pleated to save time and achieve optimal fit in conical filter funnels. Whatman™ Qualitative Filter Paper: Grade 597½ Pleated Circles provide extra surface area to increase total loading capacity.
Promotions are available
Cytiva Whatman™ Grade 520 a Filter Papers for Technical Use
A thin paper with great wet strength and a very high flow rate. Frequently used in technical applications such as the filtration of viscous liquids and emulsions (e.g., sweetened juices, spirits and syrups, resin solutions, oils, or plant extracts).
Cytiva Whatman™ Grade 2589d Qualitative Filter Paper Sheet
A very thick filter with high wet strength. Offers medium to slow flow rate and retains very fine precipitates.