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.