DC Resistance or Conductance of Insulating Materials
ASTM D257 - National Technical Systems (NTS)
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 D4496 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.
Topics
- Resistance
- Conductance
- DC
- SIR Testing
- Surface Insulation Resistance Testing
- Resistance Test
- Resistance Standards
- Surface Resistance
- Bias Test
- Insulation Test
- Insulation Resistance
- Surface Resistivity
- Time Standards
- Voltage Standards
- Test
- Electrical
- Electrodes
- Measurement
- Specimen
- Standards
- Well
- ASTM
- Bias
- Geometry
- Insulation
- MOST
- Resistivity
- Stress
- Time
- Voltage
-
product
ASTM Testing Programs
The American Society for Testing and Materials was founded over a century ago to answer the call for more uniform quality manufacturing standards in the railroad industry. ASTM International is a global organization centered on the development and delivery of international standards. As indicated on its website, ASTM has published nearly 12,000 test methods and standards. Known for advanced technical quality and market relevance, ASTM standards are used in research and development, product testing, and quality systems. ASTM standards are critical elements of the information infrastructure that guides manufacturing and trade in the global economy.
