Filter paper. We all usage it at once or another. Even if it is we’re testing soil samples, removing dissolved gases from beer, or perhaps simply soaking up the coffee spill.

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But carry out you recognize why you’re using that class of filter paper? Is that just since your protocol tells you to?

In this back-to-basics blog, we’ll evaluation some that the many popular simple filter document grades, and pick the end a few key applications.

Whatman Filter Paper: What is Qualitative Filter Paper?

Qualitative filter papers are what most users would take into consideration general purpose filter papers. There space a vast selection of applications in and out the the laboratory. Created of cellulose fiber, these filters are made from high-quality noodle linters treated to maximize alpha cellulose.

Alpha cellulose is the most stable form of cellulose, v the highest level of polymerization. Cellulose paper made from a high percentage of alpha cellulose, such as Whatman paper, is a authorize of high quality and consistency.

Qualitative filter document grades are based upon various properties consisting of particle retention, thickness, and also weight. Unlike quantitative filter papers, of i beg your pardon ashless qualities can be shed off because that analytical applications, qualitative documents are much more suited for basic purpose use.

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Different species of Qualitative Whatman Filter paper & their Properties

The most typical qualitative document grades are 1-6, 595, 597, 598, and also 602, which have actually applications across multiple industries. Below are recaps of the grade properties and common uses.


document Grade obtainable Sizes properties Applications
Filter file Grade 1 Circles: 10 mm to 150 cm (available prepleated) Sheets: 26 x 31 mm come 600 x 600 mm particle retention1: 11µm in the name thickness: 180 µm Nominal communication weight: 87 g/m2 nominal ash content2: 0.06% Grade 1 is the most widely provided filter record in program applications requiring tool retention and also flow rate, and also is most frequently used because that clarifying liquids. Certain applications include: Qualitative analysis separation for lead sulfate, calcium oxalate, and calcium carbonate Soil evaluation and seed testing Separating foods items from connected liquid or extracting liquid Collecting atmospheric dust for photometric measure Gas detection through the enhancement of a chromogenic reagent
Filter record Grade 2 Circles: 42.5 mm to 500 mm (available prepleated) Sheets: 460 x 570 mm to 580 x 680 mm bit retention1: 8µm nominal thickness: 190 µm Nominal basis weight: 97 g/m2 in the name of ash content2: 0.06% Grade 2 is slightly much more retentive 보다 Grade 1, v an equivalent increase in filtration time. Particular applications include: Plant growth trials, where the extra absorbency is used to hold soil nutrient Contaminant surveillance in air and soil
Filter record Grade 3 Circles: 23 mm come 320 mm (available prepleated) Sheets: 26 x 31 mm to 600 x 600 mm fragment retention1: 6µm nominal thickness: 390 µm Nominal basis weight: 185 g/m2 in the name ash content2: 0.06% Grade 3 is twin the thickness of grade 1, so it have the right to hold much more precipitate without clogging and also has enhanced wet strength. The is draft for usage in Büchner funnels, and the high absorbency makes Grade 3 well suited because that sample transfer after collection.
Filter record Grade 4 Circles: 27 mm to 400 mm (available prepleated) Sheets: 38 x 114 mm come 580 x 580 mm bit retention1: 25µm nominal thickness: 210 µm Nominal communication weight: 92 g/m2 nominal ash content2: 0.06% Grade 4 is a quick filter product that is fine suited for retention of outlet particles and gelatinous precipitates, such as ferric hydroxide and aluminum hydroxide. Particular applications include: Air pollution monitoring whereby the arsenal of fine particles is not vital Routine clean-up of organic fluids or organic extracts
Filter document Grade 5 Circles: 25 mm come 320 mm (available prepleated) fragment retention1: 2.5µm in the name thickness: 200 µm Nominal basis weight: 100 g/m2 in the name of ash content2: 0.06% Grade 5 provides the maximum level of fine particle retention in the qualitative paper range, v an equivalent slow flow rate. Specific applications include: Retaining fine precipitates in chemical evaluation Clarifying cloudy suspensions in soil and water analysis
Filter document Grade 6 Circles: 42.5 mm to 240 mm (available prepleated) fragment retention1: 3µm nominal thickness: 180 µm Nominal basis weight: 100 g/m2 nominal ash content2: 0.06% Thick with a high loading capacity, great 6 provides comparable particle retention to Grade 5 through twice the flow rate. It has high absorbency and increased wet strength, and is regularly specified for boiler water analysis. Plant growth trials, wherein the extra absorbency is used to organize soil nutrient Contaminant monitoring in air and also soil
Filter record Grade 591 Sheet: 580 x 580mm bit retention1: 12µm usual thickness: 180 µm communication weight: 161 g/m2 nominal ash content2: 0.06% A special filter file with an extremely high loading volume for quick filtration of medium to outlet precipitates. Provides high absorbency and also increased wet strength. Also easily accessible prepleated as Grade 591 ½.
Filter record Grade 595 Circles: 110 mm come 150 mm (available prepleated) Sheet: 580 x 580mm particle retention1: 7µm usual thickness: 180 µm communication weight: 68 g/m2 Alpha cellulose: 98% minimum Popular thin filter papers, grade 595 offers medium-fast flow rate and fine particle retention. That is provided in a selection of routine analytical applications, including: bit separation indigenous food extracts Filtration that solids indigenous digested eco-friendly samples for iCP/AAs analysis
Filter document Grade 597 Circles: 12.7 mm to 320 mm (available prepleated) bit retention1: 4-7µm common thickness: 180 µm basis weight: 85 g/m2 Alpha cellulose: 98% minimum A medium-fast flow rate file with medium-to-fine bit retention, class 597 is supplied in a range of routine analytical applications, including: decision of fat content in food testing
Filter record Grade 597L Circles: 40mm x 100mm fragment retention1: 7µm usual thickness: 180 µm communication weight: 82 g/m2 A qualitative filter paper with low fat content. Suitable for nitrate decision in foodstuffs to §35 LMBG* (* LMBG = German legislation for food and consumer products). fragment separation from food extracts Filtration the solids from digested environmental samples for iCP/AAs evaluation
Filter paper Grade 598 Circles: 90 mm (available prepleated) Sheet: 580 x 580mm particle retention1: 8-10µm usual thickness: 320 µm basis weight: 140 g/m2 A medium-fast to rapid flow rate document with medium particle retention, grade 598 has a high thickness, providing it a high loading capacity. fragment separation from food extracts Filtration that solids from digested eco-friendly samples for iCP/AAs evaluation
Filter document Grade 602h Circles: 125 mm to 240 mm (available prepleated) fragment retention1: common thickness: 160 µm basis weight: 84 g/m2 Grade 602 h is a thick filter designed because that collecting really fine particles. The is typically used in the beverage sector for: Residual sugar decision Acidic spectra Refractometric analysis HPLC