Fig.4.(a) influence of different hardeners on the electromechanical response of silicone actuators at a prestrain of 40%. The highest electric field for each curve corresponds to the breakdown field (b) Influence of hardener (81-R) concentration on the electromechanical behavior of silicone actuators actuatoes at a prestrain of 40%. The highest electric field for each curue corresponds to the breskdown field.