Ahlstrom - 0550-4000 - FLTR PAPER 55 SIZE 40 CM (Pack of 100)

ITEM #: 3412610
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

Hardened Ashless Grades (Ash 0.006%)
These specially treated hardened ashless grades are available for critical quantitative analytical techniques requiring increased wet-strength and handling capacity. These high purity filter papers have a tough, smooth surface free of loose fibers and are ideal for collecting wet precipitates. Each grade offers a convenient combination of particle retention and flow rate and are generally used because of their high chemical resistance to strong acid and alkali.
Ahlstrom 55: 15µm - Fast Speed
This is a fast filtering grade for gravimetric analysis of coarse particles and gelatinous precipitates (i.e.: aluminum and zirconium hydro x ides) 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.
Environmental Laboratory Applications:
ASTM D4767-11 Test Method for Consolidated Undrained Tria x ial Compression Test for Cohesive Soils (also a Construction Laboratory Application)
The strength and stress-strain relationship of a cylindrical specimen of a saturated cohesive soil is tested with this method. Grade 55 is used both for a pre-filter before the porous disc and as strips on the side of the specimen that e x pedite the test.
ASTM D5084-10 Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Fle x ible Wall Permeameter (also a Construction Laboratory Application)
This method applies to measuring the hydraulic conductivity, or coefficient of permeability, when a one-dimensional, laminar flow of water moves through porous materials such as soil or rock. Grade 55 is typically used.
STM 3500-PB Lead Detection: Dithizone Method
Preparation of the dithizone includes filtering through a paper, such as Grade 94. During the sample digestion the sample is filtered through a leadfree filter paper, such as Grade 55.
Construction Laboratory Applications:
ASTM D2435-11 One-Dimensional Consolidation Properties of Soil
The magnitude and rate of consolidation of soil is determined to estimate both differential and total settlement of a structure or earth fill. The sample is restrained laterally and drained a x ially while subjected to an applied, controlled stress loading. Grade 55 is used to prevent intrusion of the soil sample into the porous disc.
ASTM D3999-11 Determination of the Modulus and Damping Properties of Soils
Using the Cyclic Tria x ial Apparatus The test is done using a Pore Water Pressure Measurement Device and a Tria x ial Apparatus. Grade 55 is recommended in the saturation phase of the procedure. It functions as a dry drainage system.
Filter Paper #55 40cm
This listing is for Pack of 100