Quantitative Filter Paper, Ashless

Photo of Whatman Grade 589/2 White Ribbon Ashless Quantitative Filter Paper

Whatman Grade 589/2 White Ribbon ashless filter paper can be used when medium fine precipitates are being collected and papers must be ashed to support analysis. Grade 589/2 is suitable for a variety of routine quantitative analysis methods, such as determination of the sand content in foodstuffs, flour analysis, and aqueous suspension analysis in the paper industry. Herzberg filtration speed of 140s.

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Photo of Ahlstrom Grade 74 Medium Speed Ashless Quantitative Filter Paper

Ahlstrom 74, 2.0mm - Medium Speed has medium flow rate and good particle retention and is the most commonly used acid-washed filter. Covers a wide range of general ashless filtration applications. It is used for gravimetric analysis of numerous components (e.g.: cements, copper, clay, bismuth, silicon, iron) found in heavy industries such as construction, mining or steel. Used as a high purity filter for speedy filtering of trace elements such as silver chromate, lead sulfate, zinc and ammonium hydroxides. Also found in general soil analysis for separating solid from aqueous extracts.

Photo of Whatman Grade 44 Quantitative Filter Paper

Whatman No. 44, quantitative ashless. Thin version of Grade 42 retaining very fine particles (3 µm) but with lower ash weight per sample and almost twice the flow rate as Grade 42. 100 circles/box.

Photo of Whatman Grade 43 Quantitative Filter Paper

Whatman No. 43. Intermediate in retention (16 µm) between Grade 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. 100 circles/box.

Photo of Whatman Grade 42 Quantitative Filter Paper

Whatman No. 42 is a world standard for critical gravimetric analysis with the finest particle retention (2.5 µm) of all Whatman cellulose filter papers. Typical analytical precipitates include barium sulfate, metastannic acid and finely precipitated calcium carbonate. 100 per box.

Photo of Whatman Grade 41 Quantitative Filter Paper

Whatman No. 41 is the fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum hydroxides). Retention is 20 to 25 µm. 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 Whatman Disposable Filter Funnel. This is a convenient, disposable 47mm filter funnel with a 250mL capacity. The 47mm Grade 41 filter can be easily removed for further analysis or culturing. 100 circles/box.

Photo of Whatman Grade 40 Quantitative Filter Paper

Whatman No. 40 is the classic general purpose quantitative ashless filter paper with medium speed and retention (8 µm). 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 spectrophotometry. Used also as a high purity filter in the collection of trace elements and radionuclides from the atmosphere.

Photo of Whatman S&S Grade 589/3 Blue Ribbon Ashless Quantitative Filter Paper

Blue Ribbon Filter 589/3 ashless standard filter paper for very fine precipitates (class 2d acc. to DIN 53 135). 2 µm retention. 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.