Ahlstrom - CP616089 - Filter Paper #74 11cm Circles, Bulk

ITEM #: 14243853
Ahlstrom manufactures a series of e x tremely 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 hydro x ides. Ahlstrom 74 is also found in general soil analysis for separating solid from aqueous e x tracts.
Environmental Laboratory Applications:
STM 3500-Li Lithium Detection: Flame Emission Photometric Method
During sample preparation, the liquid may be filtered through a medium-porosity paper, such as Grade 74, to suppress ionization.
STM 5520.B-D Oil and Grease: Partition- Gravimetric Method, Partition-Infrared Method, So x hlet E x traction Method
During the separation process of the partition methods, the sample is filtered through Grade 74. This grade is also used in the So x hlet method to collect the oil and grease prior to e x traction.
Mining Laboratory Applications:
ASTM E316-11 Determination of Iron in Manganese Ore
This precipitate is larger and requires a medium retention, medium flow ashless grade. Grade 74 is the recommended media.
ASTM D2492-02 Forms of Sulfur in Coal
Grade 74 is used during the initial e x traction and to determine the percent of pyritic sulfur. Grade 54 and Grade 94 are used to determine the percent of sulfate sulfur.
ASTM D5263-93 Determining the Relative Degree of O x idation in Bituminous Coal by Alkali E x traction
The amount of humic acid present in coal correlates to the degree of o x idation. Because of the high solids loading, and presence of fines, the test recommends using a bi-layer filter. Grade 74 is used as the pre-filter and Grade 94 as the main filter. This will provide the necessary filtration and ash properties needed for the procedure.
Construction Laboratory Applications:
ASTM C114-11b Chemical Analysis of Hydraulic Cement
Hydraulic Cement is tested for the presence of multiple elements with this procedure. Quantitative filters, Type II ASTM 832 E, F and G (Ahlstrom Grades 54, 74, and 94 respectively) are recommended for various steps in the process.
ASTM D-425-88 Centrifuge Moisture Equivalent in Soils
The moisture equivalent and porosity is used to give an estimate on aquifer storage coefficient. A dry sample of soil is placed in a gooch crucible that is lined with Grade 74, which is then placed in a water bath till the soil reaches stable saturation. The paper works as both a wick and barrier.
ASTM D4542-07 Pore Water E x traction and Determination of Soluble Salt Concentration of Soils by Refractometer
The salt concentration of the water in the soil is tested with this method. The sample is placed in a press with Grade 74. The sample is compressed and the e x tracted water collected and tested with a refractometer.
Filter Paper #74 11cm Circles, Bulk
This listing is for Case of 5000