Plastics Technology Laboratories  

Surface Resistivity
Volume Resistivity

ASTM D257, IEC60093

Click on the picture for a larger view

Surface resistivity is the resistance to leakage current along the surface of an insulating material. Volume resistivity is the resistance to leakage current through the body of an insulating material. The higher the surface/volume resistivity, the lower the leakage current and the less conductive the material is.

Test Procedure:
A standard size specimen is placed between two electrodes. For sixty seconds, a voltage is applied and the resistance is measured. Surface or volume resistivity is calculated, and apparent value is given (60 seconds electrification time).

Specimen size:
A 4-inch disk is preferable, but may be any practical form, such as flat plates, rods or tubes for insulation resistance.

Surface and Volume resistivity are calculated.
Surface Resistivity is expressed in ohms (per square)
Volume Resistivity is expressed in ohms - cm

Equipment Used:
Quadtech 1865 Megohmmeter/IR Tester

Intertek PTL Overview
Contact Us
Services & Tech Info
Industry Segments
Industry Segments


**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

Back to Testlopedia