Ahlstorm

Photo of Ahlstrom 7100 Cellulose Extraction Thimbles
Ahlstrom's high purity cellulose extraction thimbles are most commonly used in Soxhlet extraction units for the separation of individual components from a mixture of solids and semi-solids by solvent extraction. The use of a Soxhlet extractor provides a safe method of extraction with toxic or other noxious solvents. Ahlstrom extraction thimbles are recommended for the estimation of fats in food, analysis of lacquer and binder in paints, vitamin A and carotene extractions, and extraction of organic compounds from reaction mixtures.
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 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 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.

Photo of Ahlstrom 55 Fast Flow Rate Ashless Filter Paper
These standard ashless grades are high purity filter papers suitable for routine quantitative gravimetric techniques and in the preparation of samples for use in analysis involving instrumental techniques. Ahlstrom 55, 15 µm - Fast Speed. This is a fast filtering grade for gravimetric analysis of coarse particles and gelatinous precipitates (i.e.: aluminum and zirconium hydroxides) in acid and alkali solutions. Ahlstrom 55 is also used in air and foodstuffs analysis and for chloride and phosphorous in cement, coal and coke.
Photo of Ahlstrom 542 Medium Flow Rate Pre-Pleated Filter Paper
Ahlstrom's pre-pleated grades can save valuable time and maximize the efficiency of the laboratory filter system. Pleating improves the effective surface area increasing flow rate and loading capacity thus decreasing filtration time. Pleated circles are available in 12.5cm to 50cm diameters. Grade 542 has a medium flow rate filtering speed with 2 µ particle retention.
Photo of Ahlstrom 513 Medium Speed Qualitative Pre-Pleated Filter Paper

Ahlstrom's pre-pleated grades can save valuable time and maximize the efficiency of the laboratory filter system. Pleating improves the effective surface area increasing flow rate and loading capacity thus decreasing filtration time. Pleated circles are available in 12.5cm to 50cm diameters. Grade 513 has a medium rate filtering speed with particle retention of 6 µm.

Photo of Fast Flow Pre-Pleated Filter Paper, Ahlstrom 515
Ahlstrom offers a full range of standard pleated grades that meet your needs from grades with rapid flow rates for filtration of viscous materials to grades with tight matrices for removal of fine precipitates. Ahlstrom's pre-pleated grades can save valuable time and maximize the efficiency of the laboratory filter system. Pleating improves the effective surface area increasing flow rate and loading capacity thus decreasing filtration time. Pleated circles are available in 12.5cm to 50cm diameters. Ahlstrom
Photo of Ahlstrom Grade 193 Standard TCLP Filters

Made of acid-treated borosilicate glass microfibers with inherently low levels of barium and zinc. Recommended for use in "Test Methods for Evaluating Solid Wastes, U.S. EPA Method 1311 Toxicity Characteristic Leaching Procedure." The filter media contains no binders or other additives that may cause interference with samples. The filters resist acids and bases, and have a nominal particle retention rating of 0.7µm.*

Photo of Ahlstrom 320 Super Thick Blotting Paper
Ahlstrom 320, 2.45 mm - 240 mm /30 min. This super thick grade is one of the thickest papers on the market. Offers extremely high flow and is recommended both for electrophoresis of large molecules and as a blotter to complete the blotting sandwich in gel transfer applications. Provides a smooth and uniform texture assuring continuous contact of buffer from the chamber through the gel and transfer membrane to the opposite pole or weight.
Photo of Ahlstrom 238 Medium Thick Chromatography Paper
Ahlstrom 238, 0.35 mm - 140 mm /30 min. This medium thick paper is recommended for general chromatography applications. Ideal for use as wicks in protein or nucleic acid blotting to provide a uniform flow of buffer through the gel to the transfer membrane in a blotting sandwich. This is our most widely used blotting paper. Also suited for electrophoresis and the separation of inorganic compounds and for use in removing gels from glass supports.