NBN ISO 1304:2021

Rubber compounding ingredients — Carbon black — Determination of iodine adsorption number (ISO 1304:2016)

ACTIVE

About this standard

Languages
English and French
Type
NBN
Standards committee
CENTEXBEL/I045
Status
ACTIVE
Publication date
28 May 2021
ICS Code
83.040.20 (Rubber compounding ingredients)
Withdrawn Date

About this training

Summary

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.
In case of dispute, the preferred method is method B (potentiometric titration).