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[en] This chemical reactivity normally is not the corrosion rate, because the in-pore diffusion, and frequently also the diffusion from outside to the external surface of the graphite body, diminishes the concentration of the gaseous reactants at the inner surfaces. To evaluate these effects on the corrosion rate, it is necessary of course to know at first the chemical reactivity of the graphite, not influenced by diffusional mass transfer. A couple of years ago a member of the Institute, K. Hedden, developed a standard equipment for determining the chemical reactivity  according to Equ.(l). Since then quite a number of graphites and cokes have been tested by this method, especially also in connection with problems of gasifiers, cupolas and high furnaces.