The present invention includes methods for simultaneously producing, within a single container, two or more sections of high density carbon foam materials of defined shape. A method used to prepare high density carbon foam sections may involve heating a comminuted agglomerating bituminous coal bed, that is at least partially divided into two or more sections by the use of partitions within the coal bed, to an elevated temperature sufficient to result in the coal particles softening and melting together to form sections of a generally homogeneous, continuous, open cell carbon material. The sections of homogeneous open cell carbon material are then maintained at an elevated temperature for a period of time sufficient to substantially reduce or essentially eliminate the plastic properties of the bituminous coal. As desired, the resultant high density carbon foam sections may be cooled to essentially ambient temperatures or immediately or subsequently heated to elevated temperatures as great as about 3200.degree. C., followed by cooling.