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ASTM D257-99

Historical Revision

Standard Test Methods for DC Resistance or Conductance of Insulating Materials

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1.1 These test methods cover direct-current procedures for the determination of dc insulation resistance, volume resistance, volume resistivity, surface resistance, and surface resistivity of electrical insulating materials, or the corresponding conductances and conductivities.

1.2 These test methods are not suitable for use in measuring the electrical resistivity/conductivity of moderately conductive materials. Use Test Method D4496 to evaluate such materials.

1.3 The test methods and procedures appear in the following sections:

Test Method or Procedure Section Calculation 13 Choice of Apparatus and Test Method 7 Cleaning Solid Specimens 10.1 Conditioning of Specimens 11 Effective Area of Guarded Electrode X2 Electrode Systems 6 Factors Affecting Insulation Resistance or Conductance X1 Measurements Humidity Control 11.2 Liquid Specimens and Cells 9.4 Precision and Bias 15 Procedure for the Measurement of Resistance or Conductance 12 Referenced Documents 2 Report 14 Sampling 8 Significance and Use 5 Specimen Mounting 10 Summary of Test Methods 4 Terminology 3 Test Specimens for Insulation, Volume, and Surface 9 Resistance or Conductance Determination Typical Measurement Methods X3

1.3 This standard does not purport to address all of the safety problems, 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. For a specific hazard statement, see Note 1.


SDO ASTM: ASTM International
Document Number D257
Publication Date Oct. 10, 1999
Language en - English
Page Count 18
Revision Level 99
Supercedes
Committee D09.12
Publish Date Document Id Type View
April 1, 2014 D0257-14 Revision
May 15, 2007 D0257-07 Revision
Oct. 10, 1999 D0257-99 Revision
Not Available D0257-91 Revision
March 1, 2021 D0257-14R21E01 Reaffirmation
Sept. 1, 2005 D0257-99R05 Reaffirmation