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™ Grade 601 General Purpose Filter Papers
A filter paper used in analytical works in laboratories with medium filtration velocity.
Thickness (Metric) | 0.16 mm |
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Pore Size | 5 to 13 μm |
Format | Disc |
Quantity | 100/Pk. |
For Use With (Application) | General works, hospitals, research laboratories, schools, chemical industries, cosmetics, food and beverage industries |
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 |
---|---|
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 |
Fisherbrand™ Grade 122 General Purpose Filter Papers
A general purpose filter paper used for all general works in the laboratory for excellent and consistent filtration.
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. |
Sartorius™ Qualitative and Creped Technical Papers, Grade 5 H/N
Semi-permeable paper barrier placed perpendicular to liquid or air flow
Sartorius Stedim Biotech™ Grade 603/N Creped Paper for Qualitative and Technical Analyses, Folded
Sartorius Stedim Biotech™ Grade 601/N Creped Papers for Qualitative and Technical Analyses, Folded are suitable for analytical and technical purposes and feature a fast flow rate due to their structure.
Sartorius Stedim Biotech™ Grade 1291 Qualitative Papers, Folded
Sartorius Stedim Biotech™ Grade 1291 Qualitative Papers, Folded are suitable for analytical purposes and routine analyses whenever no gravimetric analyses are required.
Sartorius™ Grade 1290 Wet-strengthened Folded Filter Qualitative Filter Papers
Used for analytical purposes and routine analyses, whenever no gravimetric analyses are required
Thickness (Metric) | 0.21 mm |
---|---|
Particle Retention | 3 to 5 μm |
Type | Qualitative Filter Paper |
Format | Folded |
Quantity | 100/Pk. |
Grade | 1290 |
Material | Cotton Linters, Refined Pulp |
Filtration Speed | 100μm/sec. |
For Use With (Application) | Used for analytical purposes and routine analyses, whenever no gravimetric analyses are required |
Sartorius Qualitative Grade 3 hw Filter Papers
This paper grade is generally used for analytical and technical purposes.
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 |
---|---|
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. |
Thickness (Metric) | 0.2 mm |
---|---|
Pore Size | 12 to 15 μm |
Particle Retention | 12 to 15 μm |
Description | Ash Content: 0.06% |
Quantity | 100 Pack |
Grade | 111 |
Material | Cellulose |
For Use With (Application) | For coarse and voluminous precipitates like Hydroxides and Sulphides |
Fisherbrand™ Grade 122 Cellulose General Purpose Filter Paper
Very fast filtration velocity. Fisherbrand™ Grade 122 Cellulose General Purpose Filter Paper is used for all general works in laboratories.
Thickness (Metric) | 0.17 mm |
---|---|
Pore Size | 17 to 30 μm |
Particle Retention | 17 to 30 μm |
Grade | 122 |
Material | Cellulose |
Fisherbrand™ Grade 55 Ashless Hardened Quantitative Filter Paper
Suitable for wide range of analytical applications.
Thickness (Metric) | 0.14 mm |
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Pore Size | 2 to 3 μm |
Particle Retention | 2 to 3 μm |
Type | Ashless Hardened Quantitative Filter Paper |
Format | Disc |
Description | Ash Content: 0.007% |
Quantity | 100/Pk. |
Grade | 55 |
Material | Refined Cellulose, Cotton Linters |
Filtration Speed | 180 sec. |
For Use With (Application) | Used for Acid solutions analysis and for filtration under high pressure |
Fisherbrand™ Grade 1101 Cellulose Technical Filter Paper
Used for filtration of fatty products and suitable for hot filtrations.
Thickness (Metric) | 0.55 mm |
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Pore Size | 38 to 75 μm |
Particle Retention | 38 to 75 μm |
Quantity | 100 Pack |
Grade | 1101 |
Material | Cellulose |
For Use With (Application) | For syrups, essential oils, varnish, resinous solutions, paints, sweetened juices, wines |
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.
Thickness (Metric) | 180 μm |
---|---|
Flow Rate | Medium |
Particle Retention | 4 to 12 μm |
Type | Ashless |
Color Code | White |
Material | Cotton Linters |
Filtration Speed | 70 s |