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 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 |
---|---|
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™ 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 |
---|---|
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 |
Sartorius™ Grade 601/N Creped Surface Filter Discs Qualitative Filter Papers
Used for analytical and technical purposes.
Cytiva Whatman™ Grade 114V Folded Qualitative Filter Papers
Supports high loading capacity due to wet-strengthened filter paper. Whatman™ Grade 114V Folded Qualitative Filter Papers offers fast filtration of course and gelatinous precipitates.
Thickness (Metric) | 190 μm |
---|---|
Pore Size | >25 μm |
Flow Rate | Fast |
Particle Retention | Coarse particles and gelatinous precipitates |
Format | Pre-pleated Circle |
Quantity | 100 Pack |
Grade | Grade 114V |
Material | Cellulose |
Filtration Speed | 38 sec. |
For Use With (Application) | Whatman Grade 114V smooth filter paper from GE is wet-strengthened for high mechanical stability. Grade 114V fluted filters are suitable for recovery of large particles and gelatinous precipitates. |
Cytiva Qualitative Filter Paper: Grade 113V Circles
Saves time required to quadrant-fold circles to fit conical filter funnels in repetitive or multiple analyses. Fisherbrand™ 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 |
---|---|
Pore Size | >30 μm |
Flow Rate | Fast |
Particle Retention | Coarse and gelatinous precipitates |
Format | Pleated Circle |
Quantity | 100 Pack |
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. |
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 |
---|---|
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. |
Sartorius™ Qualitative Filter Papers / Grade 1228
Ideal filter papers for analytical purposes and routine analyses when no gravimetric analyses are required. Qualitative Filter Papers / Grade 1228 are wet-strengthened and can be used for pressure and vacuum filtration.
Cytiva Whatman™ Qualitative Filter Papers: Grade 4 Sheets
Filters and retains course particles for monitoring air pollution. Whatman™ Qualitative Filter Papers: Grade 4 Sheets 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 |
---|---|
Pore Size | 20 to 25 μm |
Flow Rate | Fast |
Particle Retention | Coarse particles and gelatinous precipitates |
Format | Sheet |
Quantity | 100 Pack |
Grade | Grade 4 |
Material | Cellulose |
Filtration Speed | 37 sec. |
For Use With (Application) | A standard grade filter used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical. |
Cytiva Whatman™ Qualitative Filter Papers: Grade 4 Roll
Filters and retains course particles for monitoring air pollution. Whatman™ Qualitative Filter Papers: Grade 4 Roll is used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.
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.
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 |
---|---|
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 |
Fisherbrand™ Grade 14 Ashless Slowly Filtering Quantitative Filter Paper
Used for fine precipitates such as lead dioxide, calcium fluoride.
Thickness (Metric) | 0.15 mm |
---|---|
Pore Size | 3 to 5 μm |
Particle Retention | 3 to 5 μm |
Type | Ashless Quantitative Filter Paper |
Format | Disc |
Description | Ash Content: 0.007% |
Quantity | 100/Pk. |
Material | Cotton Linters |
Filtration Speed | 100 sec. |
Fisherbrand™ Grade 600 Cellulose General Purpose Filter Paper
Used in schools and as bench protective paper. Fisherbrand™ Grade 600 Cellulose General Purpose Filter Paper is economical.
Fisherbrand™ Grade 600 Cellulose General Purpose Filter Paper: Sheets
Used in schools and as bench protective paper. Fisherbrand Grade 600 Cellulose General Purpose Filter Paper is economical.
Thickness (Metric) | 0.15 mm |
---|---|
Pore Size | 10 to 20 μm |
Particle Retention | 10 to 20 μm |
Grade | 600 |
Material | Cellulose |
For Use With (Application) | Economical filter Paper used in schools and as bench protective Paper |
Fisherbrand™ Grade 600 Cellulose General Purpose Filter Paper: Discs
Used in schools and as bench protective paper. Fisherbrand™ Grade 600 Cellulose General Purpose Filter Paper is economical.
Thickness (Metric) | 0.15 mm |
---|---|
Pore Size | 10 to 20 μm |
Quantity | 100/Pk. |
Grade | 600 |
Material | Cellulose |
For Use With (Application) | Economical filter Paper used in schools and as bench protective Paper |