  High pressure gas time projection chambers (HPGTPCs) are made with a variety
of materials, many of which have not been well characterized in high pressure
noble gas environments. As HPGTPCs are scaled up in size toward ton-scale
detectors, assemblies become larger and more complex, creating a need for
detailed understanding of how structural supports and high voltage insulators
behave. This includes the identification of materials with predictable
mechanical properties and without surface charge accumulation that may lead to
field deformation or sparking. This paper explores the mechanical and
electrical effects of high pressure gas environments on insulating polymers
PTFE, HDPE, PEEK, POM and UHMW in Argon and Xenon, including studying
absorption, swelling and high voltage insulation strength.
