Electrical

ASTM D257 & ASTM D991

Summary

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.

Test Details

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.

ASTM D991

Summary

The electrical behavior of rubber products used in particular applications is important for a variety of reasons such as safety, static changes, current transmission, etc. This test method is useful in predicting the behavior of such rubber products.

Test Details

This test method covers the determination of volume resistivity of rubbers used in electrically conductive and antistatic products.

This test method assumes that the surface conductivity is negligible compared with the conductivity through the specimen.

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