Figure 6 shows the damping comparison for the same materials and the same cockroach muscle. This graph shows that both acrylic and silicone DE materials have significantly lower damping than the natural muscle. While the damping is not a good match to the natural muscle, particularly for the DE silicone, a lower damping is not expected to be a significant obstacle to achieving biomimetic performance in the long term. This is so because it is relatively easy to increase polymer damping by a number of means, such as by laminating a layer of passive, low modulus, but highly viscoelastic, polymer in the DE film structure. Alternatively, damping may be increased by using advanced electronic techniques for controlling the motion. By comparison, decreasing DE damping would have been more challenging since it is often difficult to reduce damping below a certain level for many polymers. However, the need to increase damping to better match natural muscle characteristics may become more important as biomimetic robots are built for high-speed, rough-terrain navigation.