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| Akrochem Accelerator VS |
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| Zinc salt of dibutyldithiophosphoric acid on silica carrier |
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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 - 4.0 phr, MBT 0.5 - 1.5 phr, TMTD 0.5 phr
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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