Abstract: The characteristics of porous structure of expanded graphite(EG) were studied by using mercury
porosimetry and image analysis. Mercury porosimetry may be used to measure the porous structure parameters of the pores under the micrometer
quantitative level, and the pores over micrometer quantitative level were studied by image analysis. The processing parameters have an
important influence on the porous structure of EG, the more electricity consumption used, the larger pore size and the broader distribution of the
pore size; on the other hand, the higher expanding temperature, the larger pore size and the broader distribution of the pore size.

Key words: expanded graphite, mercury porosimetry, image analysis, pore structure