This International Standard 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.
ISO 1304:2006 history
2016ISO 1304:2016 Rubber compounding ingredients - Carbon black - Determination of iodine adsorption number
2006ISO 1304:2006 Rubber compounding ingredients - Carbon black - Determination of iodine adsorption number
1999ISO 1304:1999 Rubber compounding ingredients - Carbon black - Determination of iodine adsorption number - Titrimetric method