Munktell Filtrak™ Micro-Glass Fiber Filters
Achieve optimum filtration. Munktell Filtrak™ Micro-Glass Fibers used in Munktell filters are made of 100% borosilicate glass of varying diameters fine-tuned to the particle retention and flow requirements of the grades.
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.
Cytiva Whatman™ Quantitative Filter Paper: Grade 40 Circles
Supports accurate analysis in applications sensitive to very low levels of background contamination. Whatman™ Quantitative Filter Paper: Grade 40 Circles are additionally useful in gravimetric analysis where ash content might affect weight measurements of combusted samples.
Macherey-Nagel™ MN 713 Grade Filter Paper, Folded
Cover tables, benchtops and shelves to absorb spilled/splashed liquids. Macherey-Nagel™ MN 713 Grade Filter Paper, Folded is a smooth, thick technical filter paper with medium filtration speed for use in general lab applications and to protect surfaces from a range of substances.
Cytiva Whatman™ Qualitative Filter Paper: Grade 1 Circles
Covers a wide range of laboratory applications and is frequently used for clarifying liquids. Whatman™ Qualitative Filter Paper: Grade 1 Circles are widely used standard grade filter papers for routine applications with medium retention and flow rates.
Cytiva Whatman™ Grade 2V Folded Qualitative Filter Papers
Saves time required to fit circles into conical funnels. Whatman™ Grade 2V Folded Qualitative Filter Papers provide medium flow and nominal particle retention rating of 8µm at a higher filtration speed.
Cytiva Whatman™ Qualitative Filter Paper: Grade 2 Circles
Retains and absorbs more than Grade 1 filters, with a corresponding increase in filtration time. Whatman™ Qualitative Filter Paper: Grade 2 Circles are used for monitoring specific contaminants in the atmosphere and in soil testing.
Cytiva Whatman™ Grade 91 Wet Strengthened Qualitative Filter Papers - Circles
High wet strength due to the addition of chemically stable resin
Munktell Filtrak™ Grade MGA Binder-Free Micro-Glass Fiber Filters
For general laboratory filtration, clarification of buffer and reagent solutions.
Fisherbrand™ Grade 601 General Purpose Filter Papers
A filter paper used in analytical works in laboratories with medium filtration velocity.
Cytiva Whatman™ Qualitative Filter Paper: Grade 4 Circles
Filters and retains course particles for monitoring air pollution. Whatman™ Qualitative Filter Paper: Grade 4 Circles are used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.
Cytiva Whatman™ Grade 589/3 Quantitative Filter Paper Circles
Captures very fine particulate samples such as insoluble molecules in fats or oils. Whatman™ Grade 589/3 Quantitative Filter Paper Circles provide accurate measurement of ash-free dry mass.
Munktell Filtrak™ Grade 1003 General Purpose Qualitative Filter Paper
Suitable for typical general filtration tasks.
Fisherbrand™ Grade 113 Cellulose Medium Filtering Qualitative Filter Paper
Filters fine particulates.
Cytiva Whatman™ Grade 287 1/2 Folded Filter Paper
Folded filter paper saves time, increases loading capacity
Cytiva Whatman™ Qualitative Filter Paper: Grade 595 ½ Pleated Circles
Pleated to save time and achieve optimal fit in conical filter funnels. Whatman™ Qualitative Filter Paper: Grade 595 ½ Pleated Circles provide extra surface area to increase total loading capacity.
Cytiva Whatman™ Quantitative Filter Paper: Grade 41 Circles
Use for quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates or for quantitative air pollution analysis. Whatman™ Quantitative Filter Paper: Grade 41 Circles are commonly used in preparing samples for metal analysis after nitric acid digestion.
Cytiva Whatman™ Grade 589/2 Quantitative Filter Paper
Retains medium fine precipitates using material with virtually no ash content. Whatman™ Grade 589/2 Quantitative Filter Paper is used when medium fine precipitates are being collected and papers must be ashed to support analysis.
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™ Grade 43 Quantitative Filter Paper
Contains very low ash content appropriate for gravimetric analyses requiring sample combustion. Whatman™ Grade 43 Quantitative Filter Paper can be ashed during gravimetric analysis without contributing substantially to the measured weight.
Cytiva Whatman™ Quantitative Filter Paper: Grade 42 Circles
Filters and retains extremely small particles. Whatman™ Quantitative Filter Paper: Grade 42 Circles are suitable for processes that require ashing.
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.
Cytiva Whatman™ Qualitative Filter Paper: Grade 5 Circles
Retains the fine precipitates encountered in chemical analysis. Whatman™ Qualitative Filter Paper - Grade 5 Circles are excellent clarifying filters for cloudy suspensions and for water and soil analysis.
Cytiva Whatman™ Qualitative Grade Plain Circles and Sheets - Grade 3
Used for high precipitate capacity and increased wet strength. Whatman™ Qualitative Grade Plain Circles and Sheets - Grade 3 provide double the thickness of Whatman Grade 1.
Filter papers are familiar consumables in the laboratory normally used with a conical funnel or similar device for the filtering and retention of solids, particulates and other contaminants from aqueous solutions, suspensions, solvents and other liquids. Filter papers are manufactured from natural cellulose linters or from glass or quartz fibres. They are available in various diameters as pre-cut plain circles, or as discs ready-folded into pleats, quadrants or pyramids for convenience and to maintain optimal, clog-free flow rates. Filter paper is also sold as sheets or rolls that can be cut to size as required.
Filter papers are described either as qualitative or quantitative. Qualitative filter papers are used for general purpose filtration applications where subsequent analytical outcomes are not critical.
Quantitative filter papers (ashless papers), are intended for more exacting analytical work. They are made from low-linting fibres that are typically acid-hardened during their manufacture to give high wet strength and chemical resistance, and are pre-rinsed with demineralised water for extra purity.
Most filter paper is also graded numerically according to pore size, which in turn infers other parameters such as flow rate, retention, thickness, weight, burst strength, and hence their nominal application.
What is filter paper used for?
- General applications in research laboratories, clinics and education
- In the analytical laboratory for removal of precipitants and particulates prior to further analysis or assay
- Industrial applications in foods, beverages, cosmetics and gravimetric analysis of cements, clays, iron and steel products
- Environmental analysis of water, soil or atmospheric samples