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
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™ 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™ 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™ 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.
Thickness (Metric) | 200 μm |
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Pore Size | 2.5 μm |
Flow Rate | Slow |
Type | Ashless |
Format | Disc |
Airflow Rate | 96 s/100 mL/in2 |
Quantity | 100 Pack |
Grade | Grade 42 |
Material | Cotton Linters |
Porosity | Fine |
Filtration Speed | 1870 sec. |
For Use With (Application) | Designed for gravimetric analysis and the preparation of samples for instrumental analysis.For critical gravimetric analysis with the finest particle retention. |
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.
Thickness (Metric) | 210 μm |
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Pore Size | 8 μm |
Flow Rate | Medium |
Particle Retention | 8 μm |
Type | Ashless |
Format | Disc |
Airflow Rate | 21 s/100 mL/in2 |
Quantity | 100 Pack |
Grade | Grade 40 |
Material | Cotton Linters |
Porosity | Medium |
Filtration Speed | ASTM, 75 seconds; Herzberg, 340 seconds |
For Use With (Application) | Designed for gravimetric analysis and the preparation of samples for instrumental analysis.Gravimetric analysis for numerous components in cements, clays, iron, and steel products.As a primary filter for separating solid matter from aqueous extracts in |
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 Grade GF/A Filter for Personal Air Samplers
These aerosol sampling and particulate monitoring filters provide high flow rates and minimal sample interference. Cytiva Whatman Grade GF/A card-mounted filters are used in static sample and personal air sampler applications.
Cytiva™ Whatman™ Pyramid Folded Filter Paper
Square pyramidal folded filter paper is easy to use and saves valuable time when undertaking repetitive or multiple analyses.
Format | Folded |
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For Use With (Equipment) | Conical Funnel |
Material (Membrane) | Cellulose |
Material | Paper |
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 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 |
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.
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 113V Circles
Saves time required to quadrant-fold circles to fit conical filter funnels in repetitive or multiple analyses. Whatman™ Qualitative Filter Paper: Grade 113V Circles boast the fastest flow rate of the qualitative grades. Crepe surface promotes ultra high loading capacity.
Thickness (Metric) | 420 μm |
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Pore Size | >30 μm |
Flow Rate | Fast |
Particle Retention | Coarse and gelatinous precipitates |
Format | Pleated Circle |
Grade | Grade 113V |
Material | Cellulose |
Filtration Speed | Herzberg 28 sec. |
For Use With (Application) | GE’s Whatman Grade 113V creped filter paper, for use with a conical filter funnel, offers fast filtration and high loading capacity for analysis involving coarse particles or gelatinous precipitates. |