In the present study, two commercially available silicone elastomers (high and room temperature vulcanizates) are filled with bariumtitanate with different particle sizes for the evaluation as a dielectric elastomer actuator. It could be shown that the particle size changes with the degree of filling. Therefore the resulting average molar mass between crosslinks and the mechanical properties are evaluated in dependence of the degree of filling and the particle size. Moreover it could be demonstrated that bariumtitanate acts as an active filler and three different bonding regmies are determined. Thus the stress and elongation at break could be increased up to more than 330 % and 160 % for the high temperature vulcanizate and up to more than 125 % and 145 % for the room temperature vulcanizate in comparison to the pure material, respectively. Furthermore a sweet spot of the mechanical properties is identified by analyzing the crosslinking density.