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ASTM D4352-90(1997)e1

(Test Method)

Standard Test Method for Determination of Magnetic Material Impurities in Electrical Grade Magnesium Oxide (Withdrawn 2003)

Standard Test Method for Determination of Magnetic Material Impurities in Electrical Grade Magnesium Oxide (Withdrawn 2003)

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1.1 This test method covers the determination of magnetic material content of fused electrically insulating magnesium oxide powders.  
1.2 The values stated in acceptable metric units are to be regarded as the standard.  
1.3 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.

General Information

Status
Withdrawn
Publication Date
09-Sep-1997
Withdrawal Date
30-Nov-2003
ICS
71.060.20 - Oxides
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Current Stage
Ref Project

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ASTM D4352-90(1997)e1 - Standard Test Method for Determination of Magnetic Material Impurities in Electrical Grade Magnesium Oxide (Withdrawn 2003)ASTM D4352-90(1997)e1 - Standard Test Method for Determination of Magnetic Material Impurities in Electrical Grade Magnesium Oxide (Withdrawn 2003)
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ASTM D4352-90(1997)e1 - Standard Test Method for Determination of Magnetic Material Impurities in Electrical Grade Magnesium Oxide (Withdrawn 2003)
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
e1
Designation: D 4352 – 90 (Reapproved 1997)
Standard Test Method for
Determination of Magnetic Material Impurities in Electrical
Grade Magnesium Oxide
This standard is issued under the fixed designation D 4352; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE— Keywords were added editorially in October 1997.
1. Scope 5.2 Laboratory Balance, capable of weighing 130 6 0.1 g.
1.1 This test method covers the determination of magnetic
6. Calibration and Standardization
material content of fused electrically insulating magnesium
6.1 The magnetics analyzer should be calibrated according
oxide powders.
to the instrument instructions manual.
1.2 The values stated in acceptable metric units are to be
regarded as the standard.
NOTE 1—This procedure may vary somewhat when using an analyzer
1.3 This standard does not purport to address the safety other than the Netronics Magnetics Analyzer.
problems associated with its use. It is the responsibility of the
7. Procedure
user of this standard to establish appropriate safety and health
7.1 Obtain a sample to be tested in accordance with Test
practices and determine the applicability of regulatory limita-
Method D 2755.
tions prior to use.
7.2 Weigh a 130 6 0.1 g specimen.
2. Referenced Documents
7.3 Set sample weight dial to 130.
7.4 Set range selector switch to 0.1.
2.1 ASTM Standards:
D 2755 Test Method for Sampling and Reduction to Test 7.5 Zero instrument with empty sample tube using the null
adjustment.
Weight of Electrical Grade Magnesium Oxide
7.6 Transfer test sample to sample tube.
3. Summary of Test Method
7.7 Insert sample tube into sample compartment of the
3.1 A sample of electrical grade magnesium oxide is placed instrument and read percent magnetics content directly from
into the magnetic analyzer sample tube. The magnetic materi- display meter.
als content is then read directly as percent contained.
8. Report
4. Significance and Use
8.1 Report the following:
4.1 Free iron in magnesium oxide powder is detrimental to 8.1.1 Identification of the sample, and
electrical characteristics of the powder when used as electrical 8.1.2 Percentage magnetic material to nearest 0.001
...

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