ISO 1304-2016 pdf free.Rubber compounding ingredients一Carbon black – Determination of iodine adsorption number.
ISO 1304 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 nwasure 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).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 385, Labo ratory glassware — Burettes
ISO 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 1126, Rubber compounding ingredients — Carbon black — Determination of loss on heating
3 Principle
A test portion of carbon black is dried, weighed and mixed vigorously with a measured volume of standard iodine solution. The mixture is then centrifuged. A measured volume of the clear iodine solution is titrated with a standard solution of sodium thiosulfate. From this titration value and the mass of the test portion, the iodine adsorption number of the carbon black is calculated.
NOTE Previous editions of this International Standard required a thiosulfate concentration of 0,039 4 mol/dm3 [0,039 4 N]. Since the concentration of the thiosulfate solution does not have any impact on the iodine adsorption number, this International Standard now includes a more commonly used solution of 0,05 mol/dm3 [0,05 N). The advantage is that such a solution is readily available commercially. If preferred, it can be prepared from solid sodium thiosulfate as described below.
Use of sodium thiosulfate solution of 0,039 4 mol/dm3 [0,039 4 N) is still permitted. In this case, the instructions for the preparation of the solution, the formulae used in its standardization and the formulae used in the calculation of the iodine adsorption number will have to be modified accordingly. ISO 1304 pdf download.
Tags: Rubber compounding ingredients
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