Surface Resistivity
Volume Resistivity
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ASTM D257, IEC60093
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Scope:
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.
Data:
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
Electrodes
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