ASTM-D257 Standard Test Methods for DC Resistance or Conductance of Insulating Materials

ASTM-D257 - 2014 EDITION - CURRENT
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Standard Test Methods for DC Resistance or Conductance of Insulating Materials
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Scope

1.1 These test methods cover direct-current procedures for the measurement of dc insulation resistance, volume resistance, and surface resistance. From such measurements and the geometric dimensions of specimen and electrodes, both volume and surface resistivity of electrical insulating materials can be calculated, as well as the corresponding conductances and conductivities.

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

1.3 This standard describes several general alternative methodologies for measuring resistance (or conductance). Specific materials can be tested most appropriately by using standard ASTM test methods applicable to the specific material that define both voltage stress limits and finite electrification times as well as specimen configuration and electrode geometry. These individual specific test methodologies would be better able to define the precision and bias for the determination.

1.4 This standard does not purport to address all of the safety concerns, 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.

Keywords

DC resistance; insulation resistance; surface resistance; surface resistivity; volume resistance; volume resistivity; ICS Number Code 29.035.01 (Insulating materials in general)

To find similar documents by ASTM Volume:

10.01 (Electrical Insulation (I): D69 - D2484)

To find similar documents by classification:

29.035.01 (Insulating materials in general)

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Document Number

ASTM-D257-14

Revision Level

2014 EDITION

Status

Current

Modification Type

Revision

Publication Date

June 1, 2014

Document Type

Test Method

Page Count

18 pages

Committee Number

D09.12