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Carbon bodies were molded from one calcined delayed petroleum coke and twelve medium melting point coal tar pitches having significant variations in their properties. The fabricated bodies and the coke, separately, were heat treated at six temperatures between 1150 and 3000°C. The following physical properties were determined on the bodies and the petroleum coke filler: apparent and air densities, BET surface areas, and crystallographic parameters. Other properties measured on the bodies were: reactivity to CO₂, electrical resistivity, coefficient of thermal expansion, and flexural strength. For all bodies heated to the same final temperature, only minor differences in properties were usually observed. This leads to two possible conclusions. One, the coal tar pitches produced binder carbons of similar properties at particular heat treatment temperatures. Two, because of the minor amount of residual pitch carbon in, the bodies (ca. 15%), differences in properties of binder carbons were not sufficient to produce important differences in body properties. Major changes in physical properties of the bodies were observed in going from baking to graphitizing temperatures. Such changes paralleled closely changes in properties of the filler carbon.

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