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Filter Papers

Quantitative filter papers - Ashless

Filter Papers

Quantitative filter papers - Ashless

Whatman™ quantitative filters are designed for gravimetric analysis and the preparation of samples for instrument analysis. They are available in three formats designed for specific requirements.

0.007% ash nominal for Grades 40 to 44 and a typical nominal ash content of 0.01% for the 589 Grades.These filters are very pure and suitable for a wide range of critical analytical filtration procedures.

Product Info


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.

Grade 42 (2.5 μm*)

Used 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.

* Particle retention rating at 98% efficiency

Check out the price

Whatman™ Price List 2021

Cat. Nos Description MRP INR
1440-012 GR 40 1.27CM 400/PK 2530
1440-032 GR 40 3.2CM 100/PK 2770
1440-042 GR 40 4.25CM 100/PK 2650
1440-047 GR 40 4.7CM 100/PK 2770
1440-055 GR 40 5.5CM 100/PK 2010
1440-070 GR 40 7CM 100/PK 2190
1440-090 GR 40 9CM 100/PK 2770
1440-110 GR 40 11CM 100/PK 3330
1440-125 GR 40 12.5CM 100/PK 4150
1440-150 GR 40 15CM 100/PK 5470
1440-185 GR 40 18.5CM 100/PK 8810
1440-240 GR 40 24CM 100/PK 17770
1440-320 GR 40 32CM 100/PK 41840
1440-329 GR 40 3CM 100/PK 2420
1440-6168 GR 40 45CM 100/PK 49790

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