ASTM D257-07
Standard Test Methods for DC Resistance or Conductance of Insulating Materials

Standard No.

ASTM D257-07

Release Date

2007

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D257-14

Latest

ASTM D257-14(2021)e1

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 D 4496 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 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.

ASTM D257-07 Referenced Document

• ASTM D1169 Standard Test Method for Specific Resistance (Resistivity) of Electrical Insulating Liquids
• ASTM D150 Standard Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
• ASTM D1711 Standard Terminology Relating to Electrical Insulation
• ASTM D374 Standard Test Methods for Thickness of Solid Electrical Insulation
• ASTM D4496 Standard Test Method for D-C Resistance or Conductance of Moderately Conductive Materials
• ASTM D5032 Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Glycerin Solutions
• ASTM D6054 Standard Practice for Conditioning Electrical Insulating Materials for Testing
• ASTM E104 Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions

ASTM D257-07 history

• 2021 ASTM D257-14(2021)e1 Standard Test Methods for DC Resistance or Conductance of Insulating Materials
• 2014 ASTM D257-14 Standard Test Methods for DC Resistance or Conductance of Insulating Materials
• 2007 ASTM D257-07 Standard Test Methods for DC Resistance or Conductance of Insulating Materials
• 1999 ASTM D257-99(2005) Standard Test Methods for DC Resistance or Conductance of Insulating Materials
• 1999 ASTM D257-99 Standard Test Methods for DC Resistance or Conductance of Insulating Materials
• 1991 ASTM D257-91 Standard Test Methods for D-C Resistance or Conductance of Insulating Materials