I'm working on a circuit which will rest on top of the lithium polymer cell that powers it. A large portion of this circuit would be better off with minimal temperature drift so I'm planning to place a thin silicone sheet between the two to solve this.
Of course air would be a better insulator (I think so at least) but the height requirements are quite stringent and this would be difficult to achieve with good mechanical stability.
I am quite confused as I see silicone used for both thermal insulation as well as conduction in different applications.
For instance, I have seen them used to connect heat sinks to ICs (see 3M thermally conductive interface pads for example.) I have also seen silicone used for insulating applications, and a quick google for "is silicone a thermal insulator" returns multiple pages stating "silicone has a low thermal conductivity."
What am I not understanding here? Is a silicone sheet a good idea to keep my circuit insulated from the battery temperature to some extent or would it achieve exactly the opposite of that? If so, what is a cheap, thin and widely available material that could achieve this function?