 According to the patents, both changes were made possible by selecting the PET matrix because it is pliable enough to fill voids at only 180 °C.EEStor's latest (2016) US patent WO2016094310 mentions a polymer matrix which can include epoxy and ceramic powders including composition modified barium titanate (CMBT).The patent also mentions a layer thickness of 0.1 microns to 100 microns.