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| Accelerator VS |
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| ZincSalt of Dibutyl Phosphorodithiate |
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Accelerator VS is a non-staining and non-blooming accelerator for EPDM compounds and other sulfur curable elastomers.
It offers good processing safety, medium fast curing characteristics, and is suitable for low sulfur cures.
Powerful acceleration and a high degree of cross-linking can be obtained in conjunction with secondary accelerators.
Levels of 2-4 phr Accelerator VS are typical.
For highly loaded stocks up to 5 phr may be used with 1.5 - 2.5 phr of sulfur.
For faster rates of cure and higher degrees of cross-linking secondary accelerators, such as thiazoles, dithiocarbamates and thiurams must be added.
It is important that levels are kept below the concentration causing blooming of the vulcanizates.
A typical composition range would be: Sulfur: 0.5 - 2.5 phr, Accelerator VS: 2.0 - 4.0phr, MBT: 0.5 - 1.5phr, TMTD 0.5phr, Accelerator VS yields fully cured compounds even without the use of secondary accelerators.
The physical properties of the vulcanizates are comparable to those obtained with the blooming ultra-accelerator combinations.
This is of particular value in hose and belt applications wherein normal amine based accelerators may have a deleterious effect on polyester yarn. |
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Appearance : Light gray powder
Specific Gravity : 1.42
Activity : 62% (on silica)
Solubility (active ingredient) : Soluble in Naptha, Benzene, Mineral Oils and Ethanol. |
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