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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This occurs unless the loads and radius are such that: If practicable, make ten readings.

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Test Method E is also the preferred test method for use with any paper of nominal thickness from 2 to 26 mils using a specimen consisting of a single sheet. 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 shall be more than the minimum permissible force speci? There may be instances, particularly when measuring very narrow strip specimens used for tensile tests, and so forth, when this requirement cannot be satis?

The arithmetic average of the? In selecting loads to apply to the specimen, make a calculation to see if the resulting load and radius combination is too near the yield strength. Until something better is established, the effects of time need evaluation for each material over the range of thicknesses, forces, and foot diameters asgm in testing.

Procedures NOTE 3—In the remainder of this section the word test method denotes astj combination of both a speci? Test Method E does not prohibit the testing of single sheet specimens of paper having nominal thickness under 2 mils. The arithmetic mean of the? To help prevent this interference, select only clean specimens for testing and keep them and the thickness measuring instrument covered until ready to make measurements.

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The wire or the plug gage has a diameter dimension that is known to be within Link to Active This link will always route to the current Active version of the standard. A change in the setting is usually the result of contaminating particles carried from the specimen to the contacting surfaces of the presser foot and anvil.

Observe this initial reading and then open the micrometer approximately 4 mils beyond the initial reading. Adjust the zero point. 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.

This standard has been approved for use by agencies of the Department of Defense. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

To avoid these costs, obtain procedures for cleaning such electronic gages from the instrument manufacturer. Avoid using measurement positions that are less than mils from any specimen edge. Consequently, if the radius of the presser foot is reduced by a factor, reduce the load by the same factor to keep the penetration, and therefore, the apparent thickness constant.

Avoid using measurement locations that are closer than mils from any specimen edge. Precision and Bias Data on rubber and recorder tape con?

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

Contact is made when frictional resistance initially develops to the movement of the calibrating device between the anvil and the spindle face. 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 asttm permissible force speci? During measurements, check the zero setting frequently. Failure to repeat the zero setting may be evidence of dirt on the surfaces.

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Historical Version s – view previous versions of standard. Use standard gage blocks or other metallic objects of known thickness.

See also Note 6. See also Appendix X1. Observe this initial reading and then open the micrometer approximately 4 mils beyond the initial reading and move the specimen to the? Perform calibration procedures at least once every 30 days.

Equip the balance with an adjustable counterbalance. The d37 foot and anvil are regarded as in? For very thin papers and values of n between 1 and 5, the ratio of total thickness asfm a stack of n sheets to n continuously decreases.

The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently wstm the other. An equation can be written expressing this idea using the equation for penetration written above: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Test results using either procedure are not signi?