International Organization for Standardization

Rubber compounding ingredients - Sulfenamide accelerators - Test methods - Second Edition
 N 11235

Annotation

This International Standard 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.

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