Pourable, addition-curing silicone

Wacker Chemie AG has developed ELASTOSIL VARIO, a modular system for pourable silicone rubber compounds with two components that enter into an addition reaction at room temperature in the presence of a platinum catalyst.

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Wacker Chemie AG (Munich, Germany) has developed ELASTOSIL VARIO, a modular system for pourable silicone rubber compounds with two components that enter into an addition reaction at room temperature in the presence of a platinum catalyst. The system permits adjustment of the compound's reactivity and the hardness of the cured elastomer, enabling compounders and silicone processors to tailor-make products. Suitable for encapsulating and coating, for making technical molded parts and for moldmaking, the system consists of four modules: two base components and two catalyst components. The former can be blended together in any ratio, and so can the latter. From these modules, the processor mixes the two components of the RTV-2 silicone rubber compound in the quantities needed for curing. The mixing ratios for the base and catalyst components can be varied to match the silicone to the application. The hardness of the cured rubber is determined by the ratio of the two base components in the mixture; Shore A durometers range from 15 to 40.