What it does

Delayed-action primary accelerator. The most common sulfenamide in tires and technical goods. Good processing safety, fast cure.

Compatible rubbers

NRSBRBRNBREPDM

Typical properties

AppearanceOff-white powder/granules
Purity≥ 95 %
Melting point≥ 98 °C
Heat loss≤ 0.3 %
Ash≤ 0.3 %
Sieve residue (150 µm)≤ 0.05 %
Density1.31–1.34 g/cm³

P marked values are PubChem literature data (pure substance). Others are typical commercial specifications and vary by producer and grade [TO BE VERIFIED].

Typical dosage

0.5–2.0 phr [TO BE VERIFIED]

FAQ

How to choose between CBS and TBBS?TBBS gives a slightly longer delay and higher modulus; it is preferred in thick parts cured at high temperature, such as tire treads. CBS is faster and common in general-purpose technical goods. Price and availability are often decisive.
Why does CBS bloom?Accelerator above the solubility limit in the compound migrates to the surface after cooling. It is seen at dosages above 1.5 phr and in low-temperature storage. The solutions are to reduce the dosage or to split the sulfenamide with a thiuram.

Related guides

Which accelerator for which rubber?Insoluble sulfur: why, how, how much?Conventional, semi-EV and EV sulfur systems

Looking to source CBS in Türkiye? Let's talk about producer selection and samples.rubberchem.com.tr →

Sources: PubChem CID 7232 · General rubber chemistry literature · PubChem page

Same class

TBBS
N-tert-Butyl-2-benzothiazolesulfenamideCAS 95-31-8
DCBS
N,N-Dicyclohexyl-2-benzothiazolesulfenamideCAS 4979-32-2
NOBS
N-Oxydiethylene-2-benzothiazolesulfenamideCAS 102-77-2
OTOS
N-Oxydiethylenethiocarbamyl-N'-oxydiethylenesulfenamideCAS 13752-51-7
TBSI
N-tert-Butyl-2-benzothiazolesulfenimideCAS 3741-80-8
CBBS
N-Cyclohexyl-N-butyl-2-benzothiazolesulfenamideCAS 3264-02-6