dds from ciba tarrytown n y with trade name ht976 with melting temperature 180 u00b0 c two types of high electrically conductive carbon blacks ketjenblack u00ae ec 300j and ec 600jd from akzo nobel chemicals inc chicago ill are used four types of expandable graphite grafguard u00ae expanding flake 160 50n 160 80n 220 50n and 220 80n graftech are used epoxy resins are prepared by mixing epon u00ae 826 and araldite u00ae dy3601 in a beaker at room temperature in a desired weight ratio followed by addition of curing agent dds with 5 wt excess over stoichiometric the mixture is heated to 135 u00b0 c and stirred until the mixture turns transparent in another embodiment epoxy resins and dds are added to acetone in a beaker and stirred until the solution becomes clear carbon filled epoxy composites are prepared by solution intercalation method shown in fig1 conductive fillers i e expanded graphite eg and carbon black cb are added into the mixture of epoxy resins curing agent and acetone the mixture is stirred for 6 hours to promote intercalation of expanded graphite layers by molecules of epoxy resin and curing agent at the end of which acetone is evaporated and the materials dried for 24 hours at 60.