ASTM D257-14(2021)e1
Standard Test Methods for DC Resistance or Conductance of Insulating Materials

Standard No.

ASTM D257-14(2021)e1

Release Date

2021

Published By

American Society for Testing and Materials (ASTM)

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 D4496 to evaluate such materials. 1.3 These test methods describe 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D257-14(2021)e1 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/D374M Standard Test Methods for Thickness of Solid Electrical Insulation*， 2023-10-01 Update
• 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 D257-14(2021)e1 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