Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs.
- Ashless: 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades – very pure filters suitable for a wide range of critical analytical filtration procedures
- Hardened low ash: 0.015% ash maximum – treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Büchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates.
- Hardened ashless: 0.006% ash maximum – acid hardened to give high wet strength and chemical resistance with extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.
Grade 40: 8 µm
The classic general purpose ashless filter paper with medium speed and retention. Typical applications include gravimetric analysis for numerous components in cements, clays, iron, and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis, quantitative determination of sediments in milk and as a pure analytical grade clean-up filter for solutions prior to AA spectrometry. Also used as a high-purity filter in the collection of trace elements and radionuclides from the atmosphere.
Grade 41: 20 µm
The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum hydroxides). Also used in quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates. This filter is also available in the disposable filter funnel. This is a convenient, disposable 47 mm filter funnel with a 250 ml capacity. The 47 mm Grade 41 filter can be easily removed for further analysis or culturing.
Grade 42: 2.5 µm
A world standard for critical gravimetric analysis with the finest particle retention of all Whatman cellulose filter papers. Typical analytical precipitates include barium sulfate, metastannic acid, and finely precipitated calcium carbonate.
Grade 43: 16 µm
Intermediate in retention between Grades 40 and 41, and twice as fast as Grade 40. Typical applications include foodstuffs analysis; soil analysis; particle collection in air pollution monitoring for subsequent analysis by XRF techniques; and inorganic analysis in the construction, mining and steel industries.
Grade 44: 3 µm
Thin version of Grade 42 retaining very fine particles but with lower ash weight per sample and almost twice the flow rate of Grade 42.
Grade 589/1: 12-25 µm
‘Black Ribbon Filter’ – the established standard in quantitative analysis for the filtration of coarse precipitates (class 2a acc. to DIN 53 135). Ashless filter paper with very high flow rate. Used for many quantitative standard methods, especially for gravimetric applications (e.g., determination of the ash content in foodstuffs), or for the Blaine test in the cement industry. Also available prepleated as Grade 589/1 1/2.
Grade 589/2: 4-12 µm
‘White Ribbon Filter’ – ashless standard filter paper for medium fine precipitates (class 2b acc. to DIN 53 135) offering medium filtration speed. Applied in a variety of routine methods in quantitative analysis, e.g., determination of the sａnd content in foodstuffs; determination of the grade of flour; or analysis of aqueous suspensions in the paper industry. Also available prepleated as Grade 589/2 1/2.
Grade 589/3: 2 µm
‘Blue Ribbon Filter’ – ashless standard filter paper for very fine precipitates (class 2d acc. to DIN 53 135). Slow filter paper with highest efficiency for collecting very small particles. Also used for many analytical routine methods in different industries, e.g., determination of the amount of insoluble contaminants in animal and vegetable fats and oils. Also available prepleated as Grade 589/3 1/2.
| Typical Properties - Ashless Quantitative Papers | ||||||
| Grade | Description | Particle retention in liquid (µm) | Filtration speed herzberg (s) | Ash content* (%) | Typical thickness (µm) | Basis weight (g/m2) |
| 40 | Medium flow | 8† | 340 | 0.007 | 210 | 95 |
| 41 | Fast | 20† | 54 | 0.007 | 220 | 85 |
| 42 | Slow | 2.5† | 1870 | 0.007 | 200 | 100 |
| 43 | Medium to fast | 16† | 155 | 0.007 | 220 | 95 |
| 44 | Slow to medium | 3† | 995 | 0.007 | 180 | 80 |
| 589/1 | Fast | 12-25‡ | 25 | 0.01 | 190 | 80 |
| 589/2 | Medium fast | 4-12‡ | 70 | 0.01 | 180 | 85 |
| 589/3 | Slow | < 2‡ | 375 | 0.01 | 160 | 84 |
| * Ash is determined by ignition of the cellulose filter at 900°C in air † Particle retention rating at 98% efficiency ‡ Approximate values | ||||||
| Ordering Information - Quantitative Filter Papers - Ashless Grades (Ash 0.007%) | ||
| Catalog Number | Description | |
| ||
| 1440-012 | Grade 40 circles, 12.7 mm, 400/pk | |
| 1440-329 | Grade 40 circles, 30 mm, 100/pk | |
| 1440-032 | Grade 40 circles, 32 mm, 100/pk | |
| 1440-042 | Grade 40 circles, 42.5 mm, 100/pk | |
| 1440-047 | Grade 40 circles, 47 mm, 100/pk | |
| 1440-055 | Grade 40 circles, 55 mm, 100/pk | |
| 1440-070 | Grade 40 circles, 70 mm, 100/pk | |
| 1440-090 | Grade 40 circles, 90 mm, 100/pk | |
| 1440-110 | Grade 40 circles, 110 mm, 100/pk | |
| 1440-125 | Grade 40 circles, 125 mm, 100/pk | |
| 1440-150 | Grade 40 circles, 150 mm, 100/pk | |
| 1440-185 | Grade 40 circles, 185 mm, 100/pk | |
| 1440-240 | Grade 40 circles, 240 mm, 100/pk | |
| 1440-320 | Grade 40 circles, 320 mm, 100/pk | |
| 1440-6168 | Grade 40 circles, 450 mm, 100/pk | |
| 1440-917 | Grade 40 sheets, 460 x 570 mm, 100/pk | |
| ||
| 1441-325 | Grade 41 circles, 25 mm, 100/pk | |
| 1441-025 | Grade 41 circles, 25 mm, 400/pk | |
| 1441-6309 | Grade 41 circles, 25 mm, 10 000/pk | |
| 1441-040 | Grade 41 circles, 40.5 mm, 100/pk | |
| 1441-042 | Grade 41 circles, 42.5 mm, 100/pk | |
| 1441-047 | Grade 41 circles, 47 mm, 100/pk | |
| 1441-050 | Grade 41 circles, 50 mm, 100/pk | |
| 1441-055 | Grade 41 circles, 55 mm, 100/pk | |
| 1441-060 | Grade 41 circles, 60 mm, 100/pk | |
| 1441-070 | Grade 41 circles, 70 mm, 100/pk | |
| 1441-090 | Grade 41 circles, 90 mm, 100/pk | |
| 1441-105 | Grade 41 circles, 105 mm, 100/pk | |
| 1441-110 | Grade 41 circles, 110 mm, 100/pk | |
| 1441-125 | Grade 41 circles, 125 mm, 100/pk | |
| 1441-150 | Grade 41 circles, 150 mm, 100/pk | |
| 1441-185 | Grade 41 circles, 185 mm, 100/pk | |
| 1441-240 | Grade 41 circles, 240 mm, 100/pk | |
| 1441-320 | Grade 41 circles, 320 mm, 100/pk | |
| 1441-866 | Grade 41 sheets, 203 x 254 mm, 100/pk | |
| 1441-917 | Grade 41 sheets, 460 x 570 mm, 100/pk | |
| 1920-1441 | Disposable filter funnel 250 ml, 47 mm, 5/pk | |
| ||
| 1442-042 | Grade 42 circles, 42.5 mm, 100/pk | |
| 1442-047 | Grade 42 circles, 47 mm, 100/pk | |
| 1442-055 | Grade 42 circles, 55 mm, 100/pk | |
| 1442-070 | Grade 42 circles, 70 mm, 100/pk | |
| 1442-090 | Grade 42 circles, 90 mm, 100/pk | |
| 1442-110 | Grade 42 circles, 110 mm, 100/pk | |
| 1442-125 | Grade 42 circles, 125 mm, 100/pk | |
| 1442-150 | Grade 42 circles, 150 mm, 100/pk | |
| 1442-185 | Grade 42 circles, 185 mm, 100/pk | |
| 1442-240 | Grade 42 circles, 240 mm, 100/pk | |
| 1442-320 | Grade 42 circles, 320 mm, 100/pk | |
| 1442-6551 | Grade 42 sheets, 25.4 x 90 mm, 100/pk | |
| 1442-917 | Grade 42 sheets, 460 x 570 mm, 100/pk | |
| 1442-930 | Grade 42 sheets, 580 x 580 mm, 500/pk | |
| ||
| 1443-090 | Grade 43 circles, 90 mm, 100/pk | |
| 1443-110 | Grade 43 circles, 110 mm, 100/pk | |
| 1443-125 | Grade 43 circles, 125 mm, 100/pk | |
| 1443-150 | Grade 43 circles, 150 mm, 100/pk | |
| 1443-185 | Grade 43 circles, 185 mm, 100/pk | |
| ||
| 1444-070 | Grade 44 circles, 70 mm, 100/pk | |
| 1444-090 | Grade 44 circles, 90 mm, 100/pk | |
| 1444-110 | Grade 44 circles, 110 mm, 100/pk | |
| 1444-125 | Grade 44 circles, 125 mm, 100/pk | |
| 1444-150 | Grade 44 circles, 150 mm, 100/pk | |
| 1444-185 | Grade 44 circles, 185 mm, 100/pk | |
| 1444-240 | Grade 44 circles, 240 mm, 100/pk | |
| 1444-917 | Grade 44 sheets, 460 x 570 mm, 100/pk | |
| ||
| Grade 589/1 circles, 90 mm, 100/pk | ||
| Grade 589/1 circles, 110 mm, 100/pk | ||
| Grade 589/1 circles, 125 mm, 100/pk | ||
| Grade 589/1 circles, 150 mm, 100/pk | ||
| Grade 589/1 circles, 185 mm, 100/pk | ||
| ||
| Grade 589/1 1/2 folded filter, 150 mm, 100/pk | ||
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| Grade 589/2 circles, 12.7 mm, 1000/pk | ||
| Grade 589/2 circles, 40.5 mm, 100/pk | ||
| Grade 589/2 circles, 50 mm, 100/pk | ||
| Grade 589/2 circles, 55 mm, 100/pk | ||
| Grade 589/2 circles, 70 mm, 100/pk | ||
| Grade 589/2 circles, 90 mm, 100/pk | ||
| Grade 589/2 circles, 110 mm, 100/pk | ||
| Grade 589/2 circles, 125 mm, 100/pk | ||
| Grade 589/2 circles, 150 mm, 100/pk | ||
| Grade 589/2 circles, 185 mm, 100/pk | ||
| Grade 589/2 circles, 240 mm, 100/pk | ||
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| Grade 589/2 1/2 folded filters, 110 mm, 100/pk | ||
| Grade 589/2 1/2 folded filters, 150 mm, 100/pk | ||
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| Grade 589/3 circles, 12.7 mm, 1000/pk | ||
| Grade 589/3 circles, 110 mm, 100/pk | ||
| Grade 589/3 circles, 125 mm, 100/pk | ||
| Grade 589/3 circles, 150 mm, 100/pk | ||
| Grade 589/3 circles, 185 mm, 100/pk | ||
| Supporting Documentation - Quantitative Filter Papers - Ashless Grades (Ash 0.007%) |
| Document Name |
 Filtration Simplified |
| Quantitative Filter Paper Quick Pick Reference Chart |
| Typical Properties of Cellulose Filters |
| Typical Properties S&S Quantitative Filters |
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