ISO 11235:2023

Rubber compounding ingredients — Sulfenamide accelerators — Test methods ISO 11235:2023

General information

60.60 Standard published   Jul 24, 2023


ISO/TC 45/SC 3 Raw materials (including latex) for use in the rubber industry

International Standard

83.040.20   Rubber compounding ingredients


This document specifies the methods to be used for the evaluation of sulfenamide accelerators:
—     MBTS: benzothiazyl disulphide;
—     CBS: N-cyclohexylbenzothiazole-2-sulfenamide;
—     TBBS: N-tert-butylbenzothiazole-2-sulfenamide;
—     DIBS: N,N'-diisopropylbenzothiazole-2-sulfenamide;
—     DCBS: N,N'-dicyclohexylbenzothiazole-2-sulfenamide;
—     MBS: N-oxydiethylenebenzothiazole-2-sulfenamide.
NOTE 1        Although MBTS is not a sulfenamide, it is the primary decomposition product of these accelerators and quantitatively determined by the method specified in 5.2.
The analytical methods are applicable for most commercial sulfenamide accelerators:
—     sulfenamides of primary amines (type I);
—     sulfenamides of unhindered secondary amines (type II);
—     sulfenamides of hindered secondary amines (type III).
NOTE 2        Classification and key properties of sulfenamide accelerators are described in Annex A.
The method (5.2) to determine purity by high performance liquid chromatography (HPLC) is the preferred method.

Life cycle


ISO 11235:2016


ISO 11235:2023
60.60 Standard published
Jul 24, 2023