Volume Resistivity ASTM

The usual standard methods for volume and surface resistivity both use the same test piece and electrode geometry and essentially the same measuring circuit. There are no ISO or IEC methods for rubbers but, where national standards specifically for polymers exist, they are usually adaptations of the IEC Publication 600931 for insulating materials in general. The relevant British Standards for rubbers are BS 903-C12 for surface resistivity and BS 903-C23 for volume resistivity. ASTM has an equivalent to the IEC standard for insulating materials generally, D2574, but no standard specifically for rubbers. 

The electrical resistance of plastics is commonly measured both through the volume of the plastic (known as volume resistivity, ASTM D257) and on the surface of the plastic (known as surface resistivity). The term for volume resistivity is ohm-cm, and the term for surface resistibility is ohms per square. Both terms are derived from a mathematical expression based on the dimensions of the test piece and the resistance measured for that test piece. 

Polymer Type Volume Resistivity, (ASTM D257) (Q cm)... 

Notes x data ARP 1524, Al-alloy, phosphoric acid etch, 1 hr cure (28 day cure). x(wet) 7 day cure, 60 hrs, water immersion. x(-20) 7 day cure, 60hrs exposure, oc ASTM D695. Hardness ASTM D785. Volume resistivity ASTM D2S7. ... 

Electrical conductivity and resistivity [ISO 21318 for plastics Volume Resistivity ASTM D257, lEC 60093], dielectric [Dielectric Constant/ Dissipation Factor ASTM D150, lEC 60250 DIN 53483 EN 60811 Insulating materials Dielectric Strength ASTM D149, lEC 60243], etc,... 

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