StandardDetails

1.1 These test methods cover the determination of the amount of material finer than a 75-µm (No. 200) sieve by washing of material with a maximum particle size of 75 mm (3 in.). 1.2 The methods used in this standard rely on the use of water or a dispersant to separate and remove materials finer than a 75-µm (No. 200) sieve. During these processes soluble substances, such as salts and other minerals, may also be removed. It is not within the scope of this standard to differentiate between the removal of fine particles and soluble substances. It is recommended that materials containing significant amounts of soluble substances be tested using other methods of separation. 1.3 Two methods for determining the amount of material finer than the 75-µm (No. 200) sieve are provided. The method to be used shall be specified by the requesting authority. If no method is specified, the choice should be based upon the guidance given in 5.2, 5.3, and 5.4. 1.3.1 Method A—Test specimen is dispersed by soaking in water prior to wash sieving. 1.3.2 Method B—Test specimen is dispersed by soaking in a dispersing solution prior to wash sieving. 1.4 Units—The values stated in SI units are to be regarded as standard. Except the sieve designations are typically identified using the “alternative” system in accordance with Specification E11, such as 3 inch and No. 200, instead of the “standard” of 75-mm and 75-µm, respectively. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. The use of balances or scales recording pounds of mass (lbm) shall not be regarded as nonconformance with this standard.