thermally conductive/ electrically insulative

I've worked with diamond filled epoxies that were in that price range, but you would never find anyone who would produce them in hundred pound quantities. I was getting 3cc syringes.

If you can use an epoxy based material, I would recommend talking to Dr. Brenner at MasterBond.

Hope this helped.

Diamond filled epoxies ... rotoblator?

Thanks for the suggestion. We're really looking for a thermoplastic. I've talked with RTV (they had the high price - it was a filled polycarbonate) and I've been trying to get the people at Cool Polymers to return my call but they aren't particularly responsive. A resin broker (Entec Polymers in Florida) is going to suggest some alternatives for me also.

Mainly, I'm curious what they are putting in a polymer that would make it thermally conductive *and* electrically insulative. Conductive/conductive is easy enough to figure out (and the info is readily available) but conductive/insulative fillers?

I've made a couple wild guesses but that's about it. My interest is curiousity based only. We only need a few hundred pounds of the plastic and we certainly aren't going to try to compound it ourselves.

Bob

A number of years ago I did some work with polypropylene by filling it with boron nitride. This was intended for rechargable battery casings to allow heat disipation during the charging cycle.

It wasn't a commercial success at the time because the amount of BN needed was so high that it was cost prohibitive based on the volume fraction required to get a large enough jump in thermal conductivity.