VP Si 525 is a silane coupling agent for silica filled peroxide cured rubber compounds. Compared to the standard silanes for peroxide curing, like vinyltris (2-methoxyethoxy) silane (VTMOEO) or vinyl trimethoxy silane (VTMO), the coupling agent VP Si 525 does not emit toxic substances, neither during production nor during the life cycle of the rubber goods, according to the company. Instead of the evolution of noxious alcohols like 2-methoxyethanol or methanol during the mixing process, only small amounts of ethanol are produced. VP Si 525 reduces the evolution of volatiles by 70%, while providing the same coupling efficiency and product properties, according to the company. Another advantage is said to be the high flash point, which makes handling easier and improves safety aspects remarkably. Comparable product properties can be achieved with significantly lower silane concentrations, according to the company. The required amount of coupling agent can be reduced.
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