daggertX
Active member
I had some large ICs that needed to use the case as a heat sink. I ended up using pure silicon caulking rated to 150 C to do the job. I was contemplating fireblock silicon that was rated for very high temps but read on the label that it contained iron oxide flakes. At that time I was concerned about maintaining the electrically isolating properties. I have since read on wikipedia that iron oxide will not make the silicon conduct electricity and that its used in aerospace industry frequently around conduits. This makes since since rust can conduct heat but not electricity. Anybody have any experience? Because a 7$ 10.1 oz tube is a better deal than a 100x100mm sheet of "elastomeric silcon" that is 20-30$. Also more conforming to the part for possibly better heat transfer.