The standards currently available are presented in the following scientific publication:

Title: Standards for dielectric elastomer transducers
Authors: F. Carpi, I. Anderson, S. Bauer, G. Frediani, G. Gallone, M. Gei, C. Graf, C. Jean-Mistral, W. Kaal, G. Kofod, M. Kollosche, R. Kornbluh, B. Lassen, M. Matysek, S. Michel, S. Nowak, B. O'Brien, Q. Pei, R. Pelrine, B. Rechenbach, S. Rosset, H. Shea
Source: Smart Materials and Structures, Vol. 24, pp. 105025-1 – 105025-25, 2015.
Link: http://iopscience.iop.org/article/10.1088/0964-1726/24/10/105025