Resistivity of aqueous extract

The Part 14 of ISO 787 gives details of the method. A sample is prepared in boiling water. If the filler is hydrophobic some methanol is added to increase its wettability. The extract is filtered, cooled to room temperature, and measured in a conductivity cell. The result is expressed as resistivity. 

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DIN 53 208 Bestimmung der elektrischen Leitfahigkeit und des spezifischen Widerstandes von waBrigen Pigment-Extrakten. ISO 787-14-1985 General methods of test for pigments, Part 14 Determination of resistivity of aqueous extract. 

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