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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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.
Thickness (Metric) | 150 μm |
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Pore Size | 7 μm |
Flow Rate | Medium fast |
Particle Retention | 7 μm |
Format | Pleated Circle |
Quantity | 100 Pack |
Grade | Grade 595 ½ |
Material | Cellulose |
Filtration Speed | Approx. 80 s |
For Use With (Application) | A prepleated filter used for many routine analytical applications in different industries (e.g., particle separation from food extracts or filtration of solids from digested environmental samples, e.g., for ICP/AAS analysis). |
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™ 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.
Thickness (Metric) | 180 μm |
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Pore Size | 4 to 7 μm |
Flow Rate | Medium Fast |
Particle Retention | 7 μm |
Format | Pleated Circle |
Quantity | 100 Pack |
Grade | Grade 597 ½ |
Material | Cellulose |
Filtration Speed | Approx. 70 s |
For Use With (Application) | A prepleated 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™ Quantitative Filter Paper: Grade 589/1 Circles
Designed for fast filtration of coarse precipitate. Whatman™ Grade 589/1 Quantitatve FIlter Paper Circles support tests such as cement fineness measurement in a standard Blaine test or determination of the ash content in foodstuffs.
Thickness (Metric) | 190 μm |
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Flow Rate | High |
Particle Retention | 12 to 15 μm |
Type | Ashless |
Format | Disc |
Color Code | Black |
Grade | Grade 589/1 |
Material | Cotton Linters |
Filtration Speed | 25 s |
For Use With (Application) | Designed for gravimetric analysis and the preparation of samples for instrumental analysis.For the filtration of coarse precipitates.For many quantitative standard methods, especially for gravimetric applications (e.g., determination of the ash content |
Cytiva Whatman™ Glass Fiber Tapes, Grade GF 10
For continuous air monitoring, compatible with air samplers from multiple manufactures globally
Type | Tape |
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Format | Roll |
Quantity | 1/Pk. |
Grade | Grade GF 10 |
Material | Glass Fiber |
For Use With (Application) | Continuous Air Monitoring |
Cytiva Whatman™ Qualitative Filter Papers – Grade 520 B
Filters particles of 15μm. Whatman™ Qualitative Filter Papers – Grade 520 B with high wet strength and flow rate are designed for technical use.
Thickness (Metric) | 500 μm |
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Particle Retention | 20 μm |
Format | Disc |
Grade | Grade 520b |
Material | Cellulose |
Filtration Speed | 30 s |
For Use With (Application) | Grade 520bll ½ thick, pleated filter paper with high wet strength offering a very high flow rate. |
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.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Thickness (Metric) | 180 μm |
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Flow Rate | 57mL/min. (water) |
Particle Retention | >11 μm |
Basis Weight | 87 g/m2 |
Format | Disc |
Airflow Rate | 13sec./100mL/sq. in. |
Grade | Grade 1 |
Material | Cellulose |
Porosity | Medium |
Filtration Speed | 150 sec. |
For Use With (Application) | A widely used standard grade filter paper for routine applications with medium retention and flow rate. It covers a wide range of laboratory applications and is frequently used for clarifying liquids. |
Cytiva Whatman™ Quantitative Filter Paper: Grade 541 Circles
Recommended when fast filtration of a gelatinous precipitate for gravimetric analysis is performed on a strongly acidic or alkali solution. Whatman™ Quantitative Filter Paper: Grade 541 Circles are acid hardened cellulose filters, which reduces ash to an extremely low level.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Thickness (Metric) | 155 μm |
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Particle Retention | 22 μm |
Type | Hardened Ashless |
Format | Disc |
Airflow Rate | 3 s/100 mL/in2 |
Quantity | 100/Pk. |
Grade | Grade 541 |
Material | Cotton Linters |
Porosity | Coarse |
Filtration Speed | ASTM, 12 seconds; Herzberg, 34 seconds |
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.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Thickness (Metric) | 190 μm |
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Flow Rate | Medium |
Particle Retention | >8 μm |
Format | Disc |
Quantity | 100 Pack |
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™ 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.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Thickness (Metric) | 390 μm |
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Grade | Grade 3 |
Material | Cellulose |
For Use With (Application) | A standard grade filter used in qualitative analytical techniques to determine and identify materials. For use in büchner funnels. |
Cytiva Whatman™ Grade 54 Quantitative Filter Paper
Supports collection of coarse and gelatinous precipitates with minimal fiber shredding, even when wet. Whatman™ Grade 54 Quantitative Filter Paper has a hard, smooth surface to sustain vacuum and suction filtration.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Thickness (Metric) | 185 μm |
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Pore Size | 22 μm |
Flow Rate | Fast |
Particle Retention | 22 μm |
Type | Hardened Low Ash |
Airflow Rate | 3 s/100 mL/in2 |
Grade | Grade 54 |
Material | Cotton Linters |
Porosity | Coarse |
Filtration Speed | ASTM, 10 seconds; Herzberg, 39 seconds |
Cytiva Whatman™ Qualitative Filter Paper: Grade 4 Circles
Filters and retains coarse 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.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Thickness (Metric) | 210 μm |
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Pore Size | 20 to 25 μm |
Flow Rate | Fast |
Particle Retention | Coarse particles and gelatinous precipitates |
Format | Disc |
Grade | Grade 4 |
Material | Cellulose |
Porosity | Medium |
Filtration Speed | 37 sec. |
Cytiva Whatman™ Qualitative Filter Papers: Grade 2555½ Pleated Circles
Maintains flow rate with reduced contact between filter and funnel. Whatman™Grade 2555½ Pleated Circles are medium fast filter papers used for the filtration of the mash for the determination of the extract in malt and wort and for removing carbon dioxide from beer.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Thickness (Metric) | 170 μm |
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Particle Retention | 12 μm |
Type | Qualitative Filter Paper |
Format | Pre-pleated Circle |
Grade | Grade 2555 ½ |
Material | Cellulose |
Filtration Speed | Approx. 55 s |
For Use With (Application) | A medium fast filter paper used for the filtration of the mash for the determination of the extract in malt and wort and for removing carbon dioxide from beer. |