FILTER PAPER

Glass microfiber filters produced from 100% borosilicate glass microfiber without the use of binders or strengthening agents. These filters offer many advantages in a wide range of analytical applications.Grade D: Coarse porosity, fast flow rate,...

Grade 6: 3 µmTwice as fast as Grade 5 with almost as fine particle retention. Often specified for boiler water analysis applications.Image(s) are representative of the product group and not necessarily the individual product.Circles, Grade 6, 3...

Grade 5: 2.5 µmThe maximum degree of fine particle filtration in the qualitative range. Capable of retaining the fine precipitates encountered in chemical analysis. Slow flow rate. Excellent clarifying filter for cloudy suspensions and for water and...

Grade 4: 20 - 25 µmExtremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Very useful as a rapid filter for routine cleanup of biological fluids or organic...

Grade 3: 6 µm: Double the thickness of Grade 1 with still finer particle retention and excellent loading capacity; more precipitate can be held without clogging. The extra thickness gives increased wet strength and makes this grade highly suitable...

Grade 2: 8 µmSlightly more retentive than Grade 1 with a corresponding increase in filtration time (i.e., slightly slower filtration speed). More absorbent than Grade 1. In addition to general filtration in the 8 µm particle size range, the...

Grade 161: 1.1 µm - Medium speed. This popular grade offers finer particle retention and higher flow rate than traditional analytical filter papers. Grade 161 is used in general laboratory applications, cell harvesting, liquid scintillation counting...

Grade 151: 0.7 µm - Slow speed. This high performance grade is designed to retain extremely fine particles down to 0.7 µm. Grade 151 has retention comparable to membrane filters while providing higher flow and loading capacity. Grade 151 is...

Grade 141: 3.1 µm - Fast speed. This grade offers better filtration speed and a higher loading capacity than an analytical filter paper of similar particle retention. Grade 141 is particularly recommended for pre-filtration of membrane filters and...

Grade 131: 1.0 µm - Medium speed. This standard grade found in many environmental applications offers slightly more retention than Grade 111 with slightly lower filtration speed and loading capacity. Grade 131 is recommended for the collection of...

Grade 121: 1.0 µm - Medium speed. This very thick grade offers finer particle retention than Grade 111 with high wet-strength and loading capacity. Grade 121 is recommended for the clarification of liquid suspensions loaded with fine particulates...

Grade 8613: 4 µm - Sugar Testing Filter Paper. Designed for the sugar industry, this grade has a smooth black finish for use in applications requiring visual examination of particles.• Qualitative analysis• Low ash content 0...

Ahlstrom Grade 642: 2 m - Medium Speed (non wet-strengthened). 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...

Ahlstrom Grade 631: 10 m - Medium Speed (non wet-strengthened). This grade is used for the filtration of coarse particles and gelatinous precipitates such as ferric aluminum and magnesium hydroxides. Ahlstrom 631 is used in air monitoring and gas...

Ahlstrom Grade 617: 35 m - Fast Speed (non wet-strengthened). This is an extremely fast filtering grade and has a larger particle retention than Ahlstrom 631. Ahlstrom 617, a thicker filter paper with higher loading capacity, is used for rapid filtration...

Ahlstrom Grade 613: 6 m - Medium Speed (non wet-strengthened). 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 Buchner...

Ahlstrom Grade 610: 1.5 m - Slow Speed (non wet-strengthened). 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...

Ahlstrom Grade 609: 4 m - Medium Speed (non wet-strengthened). This grade is an evolution of Ahlstrom 613 for use in the beer industry. This is a filter paper with an extremely low iron and nitrogen content for the analysis of protein in beer.Standard...

Ahlstrom Grade 601: 2.5 m - Medium Speed (non wet-strengthened). This grade covers a wide range of laboratory applications and is used for clarifying liquids and for rapid filtration of coarser precipitates such as lead sulfate, lead chromate, calcium...

Grade 595 1/2: 4-7 µmVery popular, thin filter paper, medium-fast with medium to fine particle retention. Used for many routine analytical applications in different industries (e.g., particle separation from food extracts or filtration of solids...

Ahlstrom 94: 1.5 m - Slow Speed. This is an extremely fine retention filter for critical gravimetric analysis of very fine particles such as barium and lead sulfates, stannic and nickel sulfide, calcium oxalate and calcium fluoride. Ashless Grades (Ash 0...

Ahlstrom Grade 320: 2.48 mm Thickness; 240 mm /30 min. Absorption Speed. This super thick grade is one of the thickest papers on the market. Ahlstrom 320 offers extremely high flow and is recommended both for electrophoresis of large molecules and as a...

Cellulose thimbles are high quality sample reservoirs for quality control, research, and analytical applications where solvent extraction of solids and semi-solids must be carried out. The use of a Soxhlet extractor provides a safe method of extraction...

Reeve Angel filter papers are manufactured primarily for non-critical industrial laboratory filtration applications requiring inexpensive filters of consistent performance. Note: These papers should not be used for kjeldahl nitrogen analysis.Grade 201 is...

Ahlstrom 54: 10 m - Fast Speed. This is a fast filtering grade for rapid filtration of coarse particles and gelatinous precipitates such as iron, zirconium and aluminum hydroxides, and cobalt sulfide. Ahlstrom 54 is also used in air pollution testing to...

Ahlstrom Grade 237: 3 m - Medium Speed (non wet-strengthened). This high absorbency grade is twice as thick as grade 642 with similar particle retention. The superior absorbency offers excellent performance when used as a sample carrier. The extra...

Grade 542: 2 µm Pleated (Fluted) Filter Paper. 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...

Grade 111: 1.2 µm - Fast speed. This grade offers fine particle retention with high filtration speed and good loading capacity. Grade 111 is used in general laboratory filtration including atmospheric and water pollution monitoring such as intake...

Grade 540: 8 µmGeneral purpose hardened ashless filter paper with medium retention and flow rate. Extremely pure and strong with a hard surface. High chemical resistance to strong acid and alkali. Frequently used in the gravimetric analysis of...

Grade 40 Ashless: 8 µmThe 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...

Grade 50: 2.7 µmUse in the retention of the finest crystalline precipitates. The thinnest of all Whatman filter papers. Slow flow rate. This finish also keeps the paper free from loose surface fibers. Highly suitable for qualitative or quantitative...

Grade 91: 10 - 25 µmSimilar thickness to Grade 114. Retains coarse or gelatinous precipitates. Used in sugar and pharmaceutical laboratories for routine filtration.Image(s) are representative of the product group and not necessarily the individual...

Grade 93: 10 µmThis filter paper is intermediate in speed and retention between Grades 1 and 4. Available in a dispenser pack, which can be attached to the wall or bench, placed on a shelf either upright or flat, and used as a normal carton or as a...

Grade 1: 11 µmMedium retention and flow rate. This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids. Traditionally the grade is used in qualitative analytical separations for precipitates such as...

Grade 2V: 8 µmWidely used for general purpose filtration. Slightly more retentive than Grade 1. Has excellent particle retention and good filtration speed and loading capacity.Image(s) are representative of the product group and not necessarily the...

A high grade filter paper impregnated with a stabilized silicone that renders the paper hydrophobic while still retaining its aqueous phase properties. As a result, the solvent phase can still flow through the filter paper quickly and cleanly. It then...

Grade 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. This grade is also used in air and...