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
Sartorius™ Grade 1288 Wet-strengthened Folded Filter Qualitative Filter Papers
Used for analytical purposes and routine analyses, whenever no gravimetric analyses are required
Sartorius™ Smooth Surface Filter Discs Qualitative Filter Papers, Grade 4b
For qualitative and technical analyses.
Sartorius Stedim Biotech™ Grade 1289 Qualitative Papers, Discs
Sartorius Stedim Biotech™ Grade 1289 Quantitative Papers, Discs are suitable for analytical purposes and routine analyses whenever no gravimetric analyses are required.
Cytiva Grade 3236 Seed Test Paper
Grade 3236 pleated strips for seed testing
Sartorius Stedim Biotech™ Germination Test Paper, Grade 193
This smooth yellow paper grade satisfies the requirements for the determination of germination capability according to ISTA (International Seed Testing Association) and is ideal for ensuring optimal moisture content for the most diverse types of seeds and germination forms.
Cytiva Grade 1V Qualitative Filter Papers, Fluted
Widely used for many general filtration applications. Whatman™ Grade 1V Qualitative Filter Papers, Fluted are the pleated, pre-folded version of Whatman filter paper 1, which is well suited for qualitative analysis in routine applications.
Cytiva Whatman™ Grade 597 Optima Qualitative Filter Papers
A standard Whatman™ grade filter paper for a variety of routine applications in food and beverage industries. Well-suited for determination of fat content in food or removal of carbon dioxide and turbidity from beverages such as beer.
Cytiva Whatman™ QM-C Quartz Filter Paper, Circles
For heavy metal analysis of particulate matter and air quality monitoring
Sartorius Stedim Biotech™ Grade 389 Quantitative Papers, Discs
Sartorius Stedim Biotech™ Grade 389 Quantitative Papers, Discs are suitable for quantitative and gravimetric analyses as well as for pressure or vacuum filtration.
Sartorius Qualitative Grade 292 Filter Papers
These qualitative filter papers are essentially used for analytical purposes and routine analyses, whenever no gravimetric analyses are required. They are wet-strengthened and can be used for pressure and vacuum filtration.
Cytiva Whatman™ Grade 114V Folded Qualitative Filter Papers
Supports high loading capacity due to wet-strengthened filter paper. Whatman™ Grade 114V Folded Qualitative Filter Papers offers fast filtration of course and gelatinous precipitates.
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.
Sartorius Qualitative Grade 601/N Filter Papers
This paper grade is generally used for analytical and technical purposes. It has a fast flow rate due to its structure.
Sartorius Stedim Biotech™ Grade 292 Qualitative Papers, Discs
Sartorius Stedim Biotech™ Grade 292 Qualitative Papers, Discs are especially suitable for qualitative analyses that require a low ash content.
