ASTM D 257 Standard Test Methods for DC Resistance or Conductance of Insulating Materials
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ASTM D 257 Document Information:
Title
Standard Test Methods for DC Resistance or Conductance of Insulating Materials
ASTM International
Publication Date:
May 15, 2007
Scope:
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.
These test methods are not suitable for use in measuring the
electrical resistance/conductance of moderately conductive
materials. Use Test Method D 4496 to evaluate such materials.
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.
The procedures appear in the following sections:
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.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- DC resistance
- insulation resistance
- surface resistance
- surface resistivity
- volume resistance
- volume resistivity
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