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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The test methods identi? See also Appendix X1.

Use these test methods except dd374 otherwise required by a material specification. The use of this technique does not require the construction of a calibration curve. Variations in thickness within a single layer are largely hidden in a stacked specimen which results in reduced ranges of high and low thickness observations on stack specimens versus single sheet specimens.

Details of the comparison procedure follow.

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Do not stop the motor until all of the measurements are made. By use of a proper manipulative procedure and a calibrated spring see Annex A1the pressure exerted on the specimen is controllable. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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 Method E is also the preferred test method for use astk any paper of aetm thickness from 2 to 26 mils using a specimen consisting of a single sheet. Select these subsequent measurement positions so that they are approximately on a line parallel to the cross machine direction of the paper. 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?

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Make an initial reading 5 s after the presser foot has contacted the specimen surface. 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.

For other pressures, refer to Table A1. Each material will differ in its response to test method parameters, which include, but may not be limited to: The other procedure uses the dial micrometer as a direct thickness reading instrument.

NOTE 1—Avoid pulling any edge of the bond paper between the surfaces to reduce the probability of depositing any d734 particles on the surfaces. Their number is a measure of deviation from? NOTE 7—When measuring the thickness of noticeably compressible electrical insulating papers, the purchaser and the supplier may wish to? Historical Version s – view previous versions of standard. Last previous edition approved in as D — NOTE 6—The procedure of 9. Until something better is established, the effects of time need evaluation for each material over the range of thicknesses, forces, and foot diameters expected in testing.

Procedures NOTE 3—In the remainder of this section the word test method denotes a combination of both r374 speci? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Grind the ends of the spring? D34 calibration procedures at least once every 30 days. 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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NOTE 4—An electronic gage may be substituted for the dial gage in Test Method C if the presser foot and anvil meet the requirements of that test method.

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To help prevent this interference, select only clean specimens f374 testing and keep them and the thickness measuring instrument covered until ready to make measurements.

Current edition approved March 10, Diameter Spindles Pressure, psig 21 22 23 24 25 26 27 28 29 Weight, g clamping asrm of the arm support will not distort the micrometer frame. Data for the plot may be obtained by making a series of measurements on a specimen using different weights with a? Avoid using measurement positions which are closer than mils from any specimen edge.

Warning—Cleaning the presser foot and anvil surfaces as described in 7. If the pressure is too low, discard the spring and replace with a new spring. An equation can be written expressing this idea using the equation for penetration written above: The d37 mean of all thickness values is the thickness of the specimen. The arithmetic average of the?

An electronic instrument having a digital readout in place of the dial indicator is permitted if that instrument meets the other requirements of 6.

This pressure is the result of the ratio of the force on the specimen exerted by gravity on the 3 oz weight of the presser foot assembly, out of asstm with the lifting mechanism to the speci? After correcting the observed indicated thickness using the calibration chart obtained in accordance with 7. Test results using either procedure are not signi?