- Apr 25, 2018-

Rubber Accelerators

SUNNYJOINT®           Predispersed Rubber Chemicals

CBS/CZ-80             Accelerator for the vulcanization of natural and diene synthetic rubbers



80%N-cyclohexyl-2-benzothiazyl sulphenamide based on specification

20% EPDM binder and dispersing agents


Grey-white or light-yellow granules

Density,20 oC

Approx. ~ 1.19 g / cm3 (20oC)

Physiological properties   :

See safety data sheet   (MSDS)

Raw material   characteristics of CBS:

Melting point ~ 96 oC

Ash content 0.4%

Evaporation loss 0.5 %

Sieve residue 63μm 0.1%

CBS content 94%

Free amine: 1.0 %

Insoluble in ethanol0.4 %


The curing accelerator SUNNYJOINT® CBS-80 provides a considerably long scorch time, great processing safety and a fast full cure. SUNNYJOINT® CBS-80 is used as a sole accelerator for the low sulphur vulcanization or in combination with dithiocarbamate or thiuram accelerators. Thevulcanizates obtained have good ageing resistance and a good compression set. The scorch time of compounds containing SUNNYJOINT® CBS-80 in combination with thiurams and dithiocarbamates is noticeably reduced. Thiourea has a strong secondary acceleration effect on SUNNYJOINT® CBS-80, mainly in mixes containing little sulphur. In compounds which are accelerated with mercaptanes and thiu-rams. SUNNYJOINT® CBS-80 may delay scorch.

Processing Advantages:

The thermoplastic, excellent compatible EPDM/EVA binder which is combined with active dispersing promoters allows much more easily and quickly incorporation and excellent dispersion in the rubber mixing. In this way, optimal activity of the effective CBS is assured.

Dosage levels:

NR: primary: 0.5-1.0 phr with 2.5 – 3.5 phr sulphur

    secondary: 0.5  phr with1.5-3.0 phr  sulphur and 0.3 mercapto or thiuram accelerators

SBR: 1.0-1.4 phr with 1.0-1.4 phr with 1.5-2.5 phr sulphur and 0-0.2 phr thiuram accelerator


Mechanical articles of all kinds, e.g. treads, carcasses, air hoses, conveyor belts, driving belts, hoses, cable insulations.


Net 25 kg cartons with plastic inner.

Storage Life:

In original closed containers under cool and dry conditions max. 2 years.


Consult material safety data sheet (MSDS) for additional handling information.