Filter Paper

Photo of Whatman Chromatography Paper and Blotting Paper

Pure cellulose grades. Whatman. Thin papers include Grade 3MM Chr, 1 Chr, 2 Chr, 4 Chr, 17 Chr, 20 Chr and 17 Chr. Specifications for each grade are as follows; 3MM Chr: Though widely used as a blotting paper, 3MM Chr is used in both electrophoresis and for general chemistry. A medium thickness paper (0.34 mm) used extensively for general chromatography and electrophoresis. Flow rate is 130 mm/30 min. Grade 1 Chr: Thickness 0.18mm. Flow rate (water) 130mm/30min. The world standard paper for chromatography. One of the thinnest papers, with medium flow rate.

Photo of Ahlstrom 613 Medium Flow Qualitative Filter Paper

This is a strong filter paper with a medium flow rate and retention. Ahlstrom 613 is commonly used in student laboratories. This strong general-purpose filter is also useful in Büchner funnels for barium carbonate, lead chromate and beryllium hydroxides. Ahlstrom

Photo of Ahlstrom 610 Slow Flow Qualitative Filter Paper

This grade is a slow flowing filter designed to retain fine particles encountered in qualitative analysis. Ahlstrom 610 is widely used for water analysis, biological products and fine precipitates such as cold-precipitated barium sulfate. Ahlstrom 610 is also used in Buchner funnels and to clarify cloudy suspensions. Ahlstrom

Photo of Ahlstrom 950 Slow Speed Wet-Strengthened Filter Paper

Wet-Strengthened Grades: Qualitative wet-strengthened grades are manufactured for applications using filter paper in a system or apparatus that operates under pressure or vacuum conditions. These systems require the use of extremely strong filter paper such as those in Ahlstrom's Binder Series. These grades contain a small amount of chemically stable, insoluble binding resin that strengthens the natural fiber-to-fiber bonds under wet conditions.

Photo of Ahlstrom 909 Medium Speed Wet-Strengthened Filter Paper

Ahlstrom 909, 3.0 mm - Medium Speed. This medium flow rate qualitative wet-strengthened grade filter paper with very good retention is a tighter version of Ahlstrom 962. This grade has a rough surface and is often found in the food industry for routine tests. Ahlstrom

Photo of Ahlstrom 601 General Purpose Filter Paper

This grade is a slow flowing filter designed to retain fine particles encountered in qualitative analysis. Ahlstrom 610 is widely used for water analysis, biological products and fine precipitates such as cold-precipitated barium sulfate. Ahlstrom 610 is also used in Büchner funnels and to clarify cloudy suspensions. Ahlstrom

Photo of Ahlstrom 642 Qualitative Fast Flow Filter Paper

This grade has finer particle retention than Ahlstrom 601 but with slightly lower filtration speed. Ahlstrom 642 also has higher absorption than Ahlstrom 601. It is used in general laboratory applications to retain particles above 2 mm in size. Ahlstrom 642 is also found in agricultural and environmental laboratories for plant growth trials, soil testing, and air analysis for monitoring specific contaminants and in the filtration of organic and sulfide precipitates. Ahlstrom

Photo of Whatman Grade 230 Reeve Angel Creped Qualitative Filter Paper

Whatman Reeve Angel Grade 230 is a general qualitative filter with creped surface. High filtration speed and high loading capacity. Widely used in industrial laboratories and students laboratories for routine filtration. The filter is wet-strengthened with a small amount of chemically stable resin to extend the life of the filter and improve handling. Normal qualitative applications will not introduce any significant impurities into the filtrate.

Photo of Whatman Grade 202 Reeve Angel Creped Qualitative Filter Paper

Whatman Reeve Angel Grade 202 is a general qualitative filter with creped surface and medium filtration speed. Faster than grade 201 and retain large crystalline coarse particles. Widely used in industrial laboratories and students laboratories for routine filtration. The filter is wet-strengthened with a small amount of chemically stable resin to extend the life of the filter and improve handling. Normal qualitative applications will not introduce any significant impurities into the filtrate. However it is not recommended for Kjeldahl nitrogen analysis. 100/box.

Photo of Whatman Grade 201 Reeve Angel Qualitative Filter Paper

Whatman Reeve Angel Grade 201 is a general qualitative filter with relatively slow filtration speed. Retains medium-fine precipitates.

Photo of Ahlstrom 962 Fast Speed Wet-Strengthened Filter Paper

Ahlstrom 962, 27 mm - Fast Speed. This fast filtering qualitative wet-strengthened grade filter paper is a thinner version of Ahlstrom 961. Recommended for the filtration of coarse and gelatinous precipitates. The creped surface also offers higher surface area to maintain high filtration speed. Ahlstrom

Photo of Ahlstrom 615 Qualitative Creped Filter Paper

This fast filtering grade is an intermediate grade between Ahlstrom 617 and Ahlstrom 631. Ahlstrom 615 has a rough surface and is used for filtering aluminum, ferric and magnesium hydroxides. It is also found in general construction filtration work and in the filtration of insoluble iron and ore. Ahlstrom

Photo of Ahlstrom 617 Qualitative Creped Filter Paper

This is an extremely fast filtering grade and has larger particle retention than Ahlstrom 631. Ahlstrom 617, a thicker filter paper with higher loading capacity, is used for rapid filtration of coarse particles and gelatinous precipitates such as in oils and resin solutions. Ahlstrom 617 is also found in construction product testing and is used by students to retain large flocculents and precipitates. Ahlstrom

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.

(Sample Photo Displayed. Individual items may differ from the image shown.)

 

Photo of Whatman Grade 597 ½ Qualitative Filter Paper Folded and Prepleated

Whatman Grade 597½ Qualitative Filter Paper that is folded & prepleated. A medium fast filter paper with medium to fine particle retention (4-7 µm). Used for a wide variety of analytical routine applications in different industries like food testing (e.g., determination of fat content) or removal of carbon dioxide and turbidity from beverages (e.g., beer analysis). 100/box.

(Sample Photo Displayed. Individual items may differ from the image shown.)

 

Photo of Whatman Grade 597 Qualitative Filter Paper

Whatman Grade 597 qualitative filter paper has a medium fast filtration speed with medium to fine particle retention (4-7 µm). Used for a wide variety of analytical routine applications in different industries like food testing (e.g., determination of fat content) or removal of carbon dioxide and turbidity from beverages (e.g., beer analysis). 100/box.

(Sample Photo Displayed. Individual items may differ from the image shown.)

 

Photo of Ahlstrom 95 Fine Retention Ashless/Hardened Quantitative Filter Paper

Ahlstrom 95: 1.5 µm - Slow Speed. This is an extremely fine retention filter for critical gravimetric analysis and metal determination of very fine particles such as barium and lead sulfates, stannic and nickel sulfide, calcium oxalate and calcium fluoride.

Photo of Ahlstrom Grade 75

Ahlstrom 75, 2.0 µm - Medium Speed. This grade has medium flow rate and good particle retention and is most commonly used for applications requiring high chemical resistance to strong acid and alkali. Ahlstrom 75 is often used for filtering trace elements, collecting hydroxides after precipitation by strong alkalis and in the analysis of metals in acid and alkali solutions.

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.