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
Cytiva Whatman™ Cellulose Nitrate Membrane Filters with Hydrophobic Rim, 50mm, 8um
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.
Cytiva Whatman™ Grade 93 Wet Strengthened Qualitative Filter Papers - Sheets
High wet strength due to the addition of chemically stable resin
Cytiva Whatman™ Grade 43 Ashless Filter Paper
Supports inorganic analysis and other forms of instrumental analyses.
Cytiva Whatman™ Grade 113 Qualitative Filter Papers
High loading capacity with a particle retention suited for use with coarse or gelatinous precipitates.
Cytiva Whatman™ Grade 1 Qualitative Filter Paper
Provides medium retention and flow rate. Whatman™ Grade 1 Qualitative Filter Paper is frequently used in clarifying liquids, soil analysis and seed testing procedures.
Cytiva Whatman™ Grade 92 Glass Microfiber Filter Paper
Improves performance and longevity of equipment. Whatman™ Grade 92 Glass Microfiber Filter Paper can be used for a wide range of applications.
Cytiva Whatman™ Qualitative Filter Papers - Grade 2V
Convenient qualitative grades offer major advantages over flat circles
Cytiva Whatman™ Pyramid Folded Filter Papers
Easy to use, saves valuable time when undertaking repetitive or multiple analyses
Cytiva Grade 0860 ½ Qualitative Filter Paper Sheet, Non-Pleated
Comparable to Grade 0858 but slightly thinner and faster, with a smooth surface.
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 3645 Seed Test Papers
For analyzing seeds with small white rootlets
Cytiva Whatman™ Grade 591 Qualitative Filter Papers
A standard grade filter for fast filtration of medium to coarse precipitates.
Cytiva Whatman™ Grade 595 Qualitative Filter Paper Sheet
For many routine analytical applications in different industries
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.