ISO 11235:2016

ISO 11235:2016 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          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).
The method (5.2) to determine purity by high performance liquid chromatography (HPLC) is the preferred method.