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
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Filtered Search Results
Fisherbrand™ Wet-Strengthened Qualitative Filter Paper Circles
Coarse cellulose fiber papers remove particles >25μm
Flow Rate | Fast |
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Particle Retention | >25 μm |
Format | Disc |
Grade | P8 |
Material | Cellulose |
Porosity | Coarse |
For Use With (Application) | Use for coarse particles and gelatinous precipitates. |
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
Flow Rate | Slow: 25mL/min. |
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Particle Retention | 4 to 8 μm |
Format | Disc |
Grade | P4 |
Porosity | Medium Fine |
Filtration Speed | 730 sec. |
For Use With (Application) | General purpose: slightly slower, more retentive than P5. Retains MgNH4PO4, silver sulfide, cadmium sulfide. In air monitors, collects particulates and chromic acid mist |
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.
Flow Rate | Fast: 160mL/min. |
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Particle Retention | 20 to 25 μm |
Format | Disc |
Quantity | 100/Pk. |
Grade | P8 |
Material | Cellulose |
Porosity | Coarse |
Filtration Speed | 55 sec. |
For Use With (Application) | Suitable for coarse and gelatinous precipitates. Retains Fe(OH)3, Al(OH)3, metallic sulfides, iron ores. For clarifying solutions, oils. For zinc analysis (Fe ppt removal). Size 19cm (09-804) widely used for sugar analysis. |
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.
Thickness (Metric) | 200 μm |
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Pore Size | 2.5 μm |
Flow Rate | Slow |
Format | Disc |
Quantity | 100 Pack |
Grade | Grade 5 |
Material | Cellulose |
Porosity | Fine |
Filtration Speed | 1420 sec. |
For Use With (Application) | A standard grade clarifying filter excellent for cloudy suspensions and for water and soil analysis. |
Cytiva Whatman™ Grade 44 Quantitative Filter Paper
Reduces overall ash content and the amount of time required for filtration. Whatman™ Grade 44 Quantitative Filter Paper provides faster gravimetric analysis with filter thinner material.
Thickness (Metric) | 176 μm |
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Pore Size | 3 μm |
Flow Rate | Medium |
Particle Retention | 3 μm |
Type | Ashless |
Format | Disc |
Airflow Rate | 56 s/100 mL/in2 |
Quantity | 100 Pack |
Grade | Grade 44 |
Material | Cotton Linters |
Porosity | Fine |
Filtration Speed | 995 sec. |
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.
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 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.
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™ 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.
Thickness (Metric) | 350 μm |
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Flow Rate | Slow |
Particle Retention | <1 μm |
Grade | GF 6 |
Material | Borosilicate Glass |
Filtration Speed | 40 s/100mL/in2 |
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.
Thickness (Metric) | 215 μm |
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Pore Size | 20 μm |
Flow Rate | Fast |
Format | Disc |
Quantity | 100 Pack |
Material | Cotton Linters |
Porosity | Coarse |
Filtration Speed | ASTM, 12 seconds; Herzberg, 54 seconds |
Cytiva Whatman™ Grade 1 Qualitative Filter Papers
The most widely used filter paper for routine laboratory applications, qualitative analytical separations, and clarifying liquids. The standard grade cellulose filter papers for medium 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.
Thickness (Metric) | 190 μm |
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Pore Size | >8 μm |
Flow Rate | Medium |
Format | Pre-pleated Circle |
Quantity | 100 Pack |
Grade | Grade 2V |
Material | Cellulose |
Porosity | Medium Fine |
Filtration Speed | 240 sec. |
For Use With (Application) | Certified for cereal analysis methods. Normal loading capacity, limited wet strength. |
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). |
Fisherbrand™ Quantitative Grade Filter Paper Circles
Manufactured to reduce silicon dioxide, calcium oxide and ferric oxide levels
Format | Disc |
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Quantity | 100/box |
Material | Alpha Cotton Cellulose |
Flow Rate | Fast |
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Particle Retention | 25 μm |
Format | Disc |
Grade | P8 Fluted |
Porosity | Coarse |
For Use With (Application) | Use for coarse particles and gelatinous precipitates. |
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
Flow Rate | Slow: 60mL/min. |
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Particle Retention | 5 to 10 μm |
Format | Sheet |
Grade | P5 |
Material | Cellulose |
Porosity | Medium |
Filtration Speed | 230 sec. |
For Use With (Application) | General lab uses: clinical and spot testing, clarifying pharmaceuticals |