This International Standard specifies a method for the measurement of the bulk density of granular carbon and graphite materials used in the manufacture of carbon electrodes for the production of aluminium. Bulk density depends on the size, shape and porosity of the granules. For samples with similar grain size and shape, comparison of the real density with the bulk density (tapped) allows the porosity to be assessed. Coke porosity is an important quality parameter which tan affect the quality and Performance of the carbon electrodes.