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ASTM A 342/A342M : 2014 : REDLINE

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Test Methods for Permeability of Weakly Magnetic Materials

Available format(s)

PDF

Superseded date

03-03-2021

Language(s)

English

Published date

01-05-2014

CONTAINED IN VOL. 03.07, 2017 Defines four procedures for determination of the permeability [relative permeability]2 of materials having a permeability not exceeding 6.0.

1.1These test methods cover four procedures for determination of the permeability [relative permeability]2 of materials having a permeability not exceeding 6.0.

1.2The test methods covered are as follows:

1.2.1Test Method 1—Fluxmetric Method is suitable for materials with permeabilities between 1.0 and 4.0. This method permits the user to select the magnetic field strength at which the permeability is to be measured.

1.2.2Test Method 2—Permeability of Paramagnetic Materials has been eliminated as an acceptable method of test.

1.2.3Test Method 3—Low Mu Permeability Indicator is suitable for measuring the permeability of a material as “less than” or “greater than” that of calibrated standard inserts with permeability between 1.01 and 6.0, as designated for use in a Low-Mu Permeability Indicator.3 In this method, a small volume of specimen is subjected to a local magnetic field that varies in magnitude and direction, so it is not possible to specify the magnetic field strength at which the measurement is made.

1.2.4Test Method 4—Flux Distortion is suitable for materials with permeability between 1.0 and 2.0. In this method, a small volume of specimen is subjected to a local magnetic field that varies in magnitude and direction, so it is not possible to specify the magnetic field strength at which the measurement is made.4

1.2.5Test Method 5—Vibrating Sample Magnetometry is suitable for materials with permeability between 1.0 and 4.0. This test method permits the user to select the magnetic field strength at which the permeability is to be measured.

1.3Materials typically tested by these methods such as austenitic stainless steels may be weakly ferromagnetic. That is, the magnetic permeability is dependent on the magnetic field strength. As a consequence, the results obtained using the different methods may not closely agree with each other. When using Methods 1 and 5, it is imperative to specify the magnetic field strength or range of magnetic field strengths at which the permeabilities have been determined.

1.4The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets except for the sections concerning calculations where there are separate sections for the respective unit systems. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.

1.5This 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.

Committee
A 06
DevelopmentNote
Supersedes ASTM A 342 (03/04)
DocumentType
Redline
Pages
11
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy

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