Dense black 3-4mm foam stuck to top of ICs?

[rgkain]

I just received new T-con board.  It is identical to old one, but has 3-4mm thick foam tape on 4 of the ICs.  At first I thought it was packing material, but it is precisely cut to exact size of the ICs, and will not come off without tearing the foam.  Is this heat sink material?