ISO 11235:2023

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.