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ASTM D374 PDF

ASTM D Standard Test Methods for Thickness of Solid Electrical Insulation. GeoTesting Express is a provider of Geosynthetic Testing Services – ASTM D, Standard Test Methods for Thickness of Solid Electrical Insulation. This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D-9 on. Electrical.

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Such a micrometer is described in Section 6 as Apparatus A.

ASTM D (Reapproved )_百度文库

This brings out the important point that at the periphery of the foot surface where r approaches RP approaches in? The use of this technique does not require the construction of a calibration curve. Data on rubber and recorder tape con? The procedures that follow are categorized according to the materials asfm which each applies.

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In such cases, it is permissible to ignore this requirement. Data for the plot astk be obtained by making a series of measurements on a specimen using different weights with a? If necessary, equip the dial with a revolution counter that displays the number of complete revolutions of the large hand.

Last previous edition approved in as D — Test results using either procedure are not signi? Make an initial reading 5 s after the asttm foot has contacted the specimen surface.

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Use standard gage blocks or other metallic objects of known thickness. To calibrate a micrometer that will exert a pressure of It is possible that combining values from the two systems will result in non-conformance with the standard.

The arithmetic mean of all thickness values is the thickness of the specimen. If the radius of the hemisphere is reduced by 4, the load on the gage must be reduced by a factor of 2 to maintain the same penetration. D — 99 stock or music-wire of known diameter are suitable substitutes.

ASTM D / DM – 16 Standard Test Methods for Thickness of Solid Electrical Insulation

The reader is directed to seek precision statements in those other ASTM standards that deal with speci? Test Method E does not prohibit the testing of single sheet specimens of paper having nominal thickness under 2 mils.

There may be instances, particularly when measuring very narrow strip specimens used for tensile asmt, and so forth, when this requirement cannot be satis?

For other pressures, refer to Table A1. Their number is a measure of deviation from? This condition necessitates the cleaning of these surfaces see 7. The initial reading estimates the specimen thickness.

NOTE 5—Originally, the selection of stack versus single astk specimens was based on data obtained using manually operated micrometers. A superscript epsilon e indicates an editorial change since the last revision or reapproval. The arithmetic mean of the? 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.

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The use of a support structure, which is level and parallel to the anvil, is recommended to minimize such problems. The force applied to the presser foot spindle and the weight necessary to just prevent movement of the pointer from a higher to a lower reading must be more than the minimum permissible force speci?

Link to Active This link will always route to the current Active version of the standard.

In selecting loads to apply to the specimen, make a axtm to see if the resulting load and radius combination is too near the yield strength. One procedure uses the dial micrometer as a comparison gage.

3d74 1—Avoid pulling any edge of the bond paper between the surfaces to reduce the probability of depositing any lint particles on the surfaces. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

NOTE 7—When measuring the thickness of noticeably compressible electrical insulating papers, the purchaser and the supplier may wish to?

After correcting the observed indicated thickness using the calibration chart obtained in accordance with 7.