Use of chloro-hydrocarbons to produce high density electrodes

In a carbon article manufactured by the process of mixing carbonaceous particles selected from the group consisting of calcined needle coke, coal coke, coal tar residue coke, calcined anthracite, graphite, graphitized aggregate and pre-grahitized coke and a carbonaceous binder selected from the group consisting of petroleum pitch, coal tar pitch, phenolic resin, furfural resin and lignosulfonates in a liquid form, shaping the resulting mixture by extrusion or molding to form said article, and baking said article to approximately 800.degree. to 900.degree. C., to carbonize said binder, the improvement comprising employing as an additive to said mixture a material selected from the group consisting of the chlorinated derivatives of naphthalene with from four to eight atoms of chlorine substituted for hydrogen atoms on said naphthalene molecules, known as the tetra, penta, hexa, hepta, and octachloro derivatives of naphthalene or mixtures of same.