Propylene Carbonate - Dielectric of the future?

I'm interested in electrostatic actuators, which require a working fluid with a high dielectric constant and low dissipation. It seems non-toxic enough, and a dielectric constant of 64 seems pretty good for the things I want to try.

Here are two companies I suspect both use it in their products:
https://www.c-motive.com/
https://www.artimusrobotics.com/

I think there are a lot of interesting things that can be done with a 6kv power supply, conductive ink, a heat sealer, and a liter or two of Propylene Carbonate.