Ahlstrom manufactures a series of extremely high purity, acid washed filter papers designed for use in analytical and gravimetric analysis. The quantitative grades are manufactured from top quality cotton linters using ultra-pure, reverse-osmosis water and are further treated with dilute acid to remove any remaining organic and inorganic impurities. All quantitative grades are manufactured in a strictly controlled environment that ensures high uniformity and high purity from filter to filter. Quantitative analysis Low ash content 0.007% (Acid-wash treated) High wet-strength Consistent performance Custom cut Bulk packaging Ashless Grades (Ash 0.007%) 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 74: 2.0µm – Medium Speed This grade has medium flow rate and good particle retention and is the most commonly used acidwashed filter. Ahlstrom 74 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. Ahlstrom 74 is also used as a high purity filter for speedy filtering of trace elements such as silver chromate, lead sulfate, zinc and ammonium hydroxides. Ahlstrom 74 is also found in general soil analysis for separating solid from aqueous extracts. Grade: 74 Retention (µm): 2.0 Filtration Speed (Herzberg sec/100mls): 229 Filtration Speed Rapidity (mls/min): 30 Loading Capacity: Medium

GR111 Filter Paper Circles 100 Circles/PK. 5.50cm diameter circles. Glass Fiber Binderless Filter Paper. Fast filtration speed absorbence. Weight 56g/m2 Thickness 0.28mm Herzberg 57 sec/100ml Rapidity 120ml/min Capillary Rise 51mm Retention 1.2um Frazier Air Flow 5cfm/ft2. Exact Match 47745-778

Ahlstrom-Munksjo Filtration LLC
Mfg Item # : 1110-1250
Ahlstrom offers a full range of glass microfiber filters manufactured from 100% pure borosilicate glass. Because of their intrinsic properties, glass microfiber filters have wide applications in many areas of laboratory analysis, especially when fine filtration and high loading capacity is required. Applications for Ahlstrom glass microfiber filters include environmental analysis for water, wastewater, testing of soils, air pollution and monitoring, research and process biochemistry, and gravimetric analysis involving ignition of samples. Ahlstrom glass microfiber filters are also found in the filtration of hot gases and liquids, and in pre-filtration. Laboratory analysis 100% pure borosilicate glass Rapid flow rate Fine particle retention 0.7µm – 3.1 µm High loading capacity Chemical and thermal resistance (up to 500°C) Long shelf life Brilliant white color reflecting more than 96% of visible light Custom cut Standard Glass Microfiber Filters Standard glass microfiber filters contain no binders or other additives that may cause interference to sensitive enzymatic or other chemical reactions. The unique characteristics of glass microfiber filters make its use particularly advantageous to laboratory filtration by enabling fast filtration of large volumes and difficult solutions without premature clogging. Ahlstrom 111: 1.2µm – Fast Speed This grade offers fine particle retention with high filtration speed and good loading capacity. Ahlstrom 111 is used in general laboratory filtration including atmospheric and water pollution monitoring such as intake controls, ozone-level, and water effluents. Grade 111 is also well suited for filtration of water and protein, testing of algae, bacteria cultures and for radioimmunoassay with weak beta emitters. Ahlstrom 111 is also recommended for filtering solvents in a high-resolution laboratory. Environmental & Mining Applications: 40CFR60 App A Method 17 – Determination of Particulate Matter Emissions from Stationary Sources This method is used instead of Method 5 when the amount of particulate matter is considered independent of temperature. With the thermal requirement eliminated, Grade 111 becomes the better recommendation because it has a higher throughput than Grade 161 while maintaining the necessary low mineral content and chemical resistance.
Exact Match: 47745-786

FILTER PAPER Glass Fiber Binderless Grade 111 15 cm circle 100/pk Exact Match 47745-788

Micro-quartz fiber thimbles meet the highest purity requirements due to the lowest possible heavy metal content. Applications include: Emission testing in high-temperature environments, Testing acidic gases not compatible with micro-glass fiber thimble.

Ahlstrom-Munksjo Filtration LLC
Mfg Item # : 5050-1850
Ahlstrom manufactures high quality analytical filter papers for use in specialty end use applications. These custom designed qualitative grades are manufactured from top quality cotton linters using ultra-pure, reverse-osmosis water. Ahlstrom specialty analytical filter papers include pleated and non-pleated grades and are found in applications such as seed, asphalt and beer testing. All grades are manufactured in a strictly controlled environment that ensures high uniformity and high purity from filter to filter. Key features Qualitative analysis Low ash content 0.06% Untreated Consistent performance Wet-strengthened  grades available Custom designed for  end-use application Custom cut Bulk packaging 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-Munksjo Filtration LLC
Mfg Item # : 5130-3850
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. Qualitative analysis Low ash content 0.06% Untreated Consistent performance Wet-strengthened grades available Custom designed for end-use application Custom cut Bulk packaging

Ahlstrom-Munksjo Filtration LLC
Mfg Item # : 6090-1100
Ahlstrom’s qualitative grades of filter paper are, by definition, recommended for use in analytical methods, which determine or identify particulate constituents of a mixture irrespective of the amount present. Qualitative filter papers are often used in routine separation work that still requires high purity and consistent performance. Ahlstrom offers a complete range of low ash filter papers for general laboratory work that provides you with the correct combination of particle retention, filtration speed, loading capacity and wet-strength. All our qualitative grades consist of > 95% super refined a-cellulose and linter fibers. Qualitative analysis Low ash content 0.06%/li> Untreated/li> Consistent performance/li> Wet-strengthened grades available/li> Custom cut/li> Bulk packaging/li> Standard Grades (Non Wet-Strengthened) Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. These grades contain a high level of alpha-cellulose that provides high purity but will weaken when wet. The inherent strength of standard (untreated) grades does not pose a problem when they are used in routine quadrant folded applications. We do not recommend these grades for use in vacuum work or when wet handling is required. Ahlstrom 609: 4Ým – Medium Speed 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.

AHLSTROM MUNKSJO FILTRATION LLC. 6100-0425
FILTER PAPER Qualitative, High Purity, Grade 610, 4.25 cm circle, 100/pk Exact Match: 47749-674

FILTER PAPER Qualitative High Purity Grade 610 12.5 cm circle 100/pk Exact Match 38005-104