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ISO 1304:2016

Current Date published:

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:

- method A: titration using a burette and starch as indicator;

- method B: potentiometric titration with an automatic titrator.

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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  • BS 3502-3:1993

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  • BS 5293-1:1990

    Sampling and testing carbon black for use in the rubber industry, Methods of sampling

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    Sampling and testing carbon black for use in the rubber industry, Method for determination of pour density

  • BS 5293-20:1992

    Sampling and testing carbon black for use in the rubber industry, Method for evaluation in styrene-butadiene rubbers

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