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ASTM E703-14

Historical Revision

Standard Practice for Electromagnetic (Eddy Current) Sorting of Nonferrous Metals

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1.1 This practice describes a procedure for sorting nonferrous metals using the electromagnetic (eddy current) method. The procedure is intended for use with instruments using absolute or comparator-type coils for distinguishing variations in mass, shape, conductivity, and other variables such as alloy, heat treatment, or hardness that may be closely correlated with the electrical properties of the material. Selection of samples to evaluate sorting feasibility and to establish standards is also described.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


5.1 Absolute and comparative methods provide a measure for sorting large quantities of nonferrous parts or stock with regard to composition or condition, or both.

5.2 The comparative or two-coil method is used when high-sensitivity examination is required. The advantage of this method is that it almost completely suppresses interferences.

5.3 The ability to accomplish these types of separations satisfactorily is dependent upon the relation of the electric characteristics of the nonferrous parts to their physical condition.

5.4 These methods may be used for high-speed sorting in a fully automated setup where the speed of examination may approach many specimens per second depending on their size and shape.

5.5 Successful sorting of nonferrous material depends mainly on the variables present in the sample and the proper selection of frequency and fill factor.

5.6 The accuracy of a sort will be affected greatly by the coupling between the test coil field and the examined part during the measuring period.

SDO ASTM: ASTM International
Document Number E703
Publication Date June 1, 2014
Language en - English
Page Count 5
Revision Level 14
Supercedes
Committee E07.07
Publish Date Document Id Type View
June 1, 2020 E0703-20 Revision
June 1, 2014 E0703-14 Revision
June 1, 2009 E0703-09 Revision
May 10, 1998 E0703-98 Revision
Jan. 1, 2004 E0703-98R04E01 Reaffirmation