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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Each material will differ in its response to test method parameters, which include, but may not be limited to: NOTE 7—When measuring the thickness of noticeably compressible electrical insulating papers, the purchaser and the supplier may wish to?

Use sstm gage blocks at points greater than 10 mil. 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?

There will be different precisions between test methods and between materials.

The limit is related to the compressive characteristics of the material being measured. D — 99 stock or music-wire of known diameter are suitable substitutes.

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See also Note 6. Diameter Spindles Pressure, psig 21 22 23 24 25 26 27 28 29 Weight, g clamping pressure of the arm support will d37 distort the micrometer frame.


The initial v374 estimates the specimen thickness. Mount the ball in a fork-shaped holder to allow the ball to be conveniently moved from one location to another between the presser foot and the anvil.

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This is in contrast to previously held perceptions of the necessity for maintaining constant average pressure. This occurs unless the loads and radius are such that: This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? NOTE 2—Exercise care with this procedure.

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. If practicable, make ten readings.

NOTE 5—Originally, the selection of stack versus single sheet specimens was based on data obtained using manually operated micrometers. To calibrate a micrometer that will exert a pressure of Use these test methods except as otherwise required by a material specification. The use of this technique does not require the construction of a calibration curve. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other.

Avoid using measurement positions that are less than mils from any specimen edge. The micrometer reading of the stack, corrected from the calibration chart, is divided by the number of layers in the stack and reported as the thickness. Test results using either procedure are not signi? The condition of zero reading is satis?


Adjust the zero point. That error magnitude will increase as specimen thickness decreases. Avoid using measurement positions that are closer than mils from any specimen edge.

Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness.

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

Test Method E does not prohibit the testing of single sheet specimens of paper having nominal thickness under 2 mils. Dressing the edge awtm the presser foot to have a slight radius avoids this effect. If the pressure is too low, discard the spring and replace with a new spring.

Last previous edition approved in as D — 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.