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Rubber compounding ingredients - Carbon black - Determination of iodine adsorption number
ISO 1304:2016 specifies methods for the determination of iodine adsorption number of carbon blacks for use in the rubber industry.
Two titration methods are described:
The iodine adsorption number is related to the surface area of a carbon black and is generally in agreement with the nitrogen surface area.
However, it is significantly depressed in the presence of a high content of volatile or solvent-extractable materials; the iodine adsorption number therefore does not always provide a measure of the specific surface area of a carbon black.
Ageing of carbon black can also influence the iodine number.
In case of dispute, the preferred method is method B (potentiometric titration).
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