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™ 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 |
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 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. |
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™ 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 |
Fisherbrand™ Qualitative Grade Plain Filter Paper Circles and Sheets - P2 Grade
Ideal for clarifying and removing particles of 1μm and larger, and in applications that do not require a low-ash or ashless paper
Particle Retention | 1 to 5 μm |
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Format | Disc |
Grade | P2 |
Porosity | Fine |
Filtration Speed | 5mL/min. |
For Use With (Application) | Ideal for clarifying and removing particles of 1μm and larger, and in applications that do not require a low-ash or ashless paper |
Fisherbrand™ Qualitative Grade Plain Filter Paper Circles - 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 | Disc |
Quantity | 100 Pack |
Grade | P5 |
Material | Cellulose |
Porosity | Medium |
Filtration Speed | 230 sec. |
For Use With (Application) | General lab uses: clinical and spot testing, clarifying pharmaceuticals |
Cytiva Whatman™ Grade 595 Qualitative Filter Circles
Separates particles from food extracts and solids from digested environmental samples. Whatman™ Grade 595 Qualitative Filter Circles are designed for medium-fast, with medium to fine particulate retention.
Particle Retention | 7 μm |
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Format | Disc |
Grade | Grade 595 |
Material | Cellulose |
Filtration Speed | Approx. 80 s |
For Use With (Application) | A standard grade 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 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 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™ Reeve Angel 226 Creped Qualitative Circles
A general qualitative filter with creped surface. High filtration speed, faster than grade 202 and retain coarse particles gelatinous precipitates.
Pore Size | 20 to 25 μm |
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Flow Rate | Fast |
Particle Retention | 20 to 25 μm |
Grade | 226 |
For Use With (Application) | A general qualitative filter with creped surface. High filtration speed, faster than grade 202 and retain coarse particles gelatinous precipitates. |
Cytiva Whatman™ Reeve Angel 230 Creped Qualitative Circles
Provide reliable performance for non-critical industrial laboratory and student lab applications
Thickness (Metric) | 0.4 mm |
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Particle Retention | 25 to 30 μm |
Format | Disc |
Grade | 230 |
Material | Cellulose |
Porosity | Coarse |
Labconco™ Fast-Freeze™ Flask Filter Paper
Supplier Diversity Partner
Small and/or diverse supplier based on Federal laws and SBA requirements.
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Small and/or diverse supplier based on Federal laws and SBA requirements.
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Fits into top of flask to prevent partial loss of product during freeze drying.
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 Grade 802 Qualitative Filter Papers
Offers fast filtration and high loading capacity for analysis involving coarse particles or gelatinous precipitates. Whatman™ Grade 802 Qualitative Filter Papers are prepleated, wet-strengthened filters for use with a conical filter funnel in routine, repetitive qualitative applications.