I need to insulate the area between two heat sinks. The gap is about 10mm, and the bottoms of the heat sinks are facing eachother with a peltier chip sandwiched in-between. However the two sinks are in separate enclosed sections, and I need to insulate the hot side from the cold side as much as I can. So my idea was to get a ceramic plate about 10mm in thickness (the thickness of the peltier chip) and hollow a square in the center and fit the chip in the middle then place the heatsinks on each side of the chip. So I am trying to find or think of a way to get a ceramic sheet or possibly some other suggested possibly more readably available material to insulate those 2 sides from eachother. If I have to I can make my own but would need some suggestion on mixing and baking ceramics. More or less would love a home depot type solution so I can just go buy a sheet of something that will do the job. Thank you in advance!