The penetration behavior of molten metal (Hg, Ag and steel) into porous refractories, that is, penetration behavior of non-wetting system has been studied experimentally and theoretically. A countermeasure to suppress the penetration of molten metal into porous refractories was suggested based on the experimental results and analysis. The penetration behavior was observed by using an X-ray radiographic apparatus. In case of steel penetration, the time dependence of penetration height was observed. The penetration behavior was analyzed using a capillary model in which a correction coefficientξM was introduced. ξM which include the effect of external pressure and physical properties of penetrated metal (｜σMcosθM/ρM｜) was proposed. The penetration behavior can be classified as Stage I (ξM＜１) and II (ξM=１). The penetration behavior of molten metal was predictable based on penetration behavior of mercury. In Stage I, the penetration of molten metal into porous refractories can be suppressed by decreasing ξM by increasing the θM and making the pores smaller than critical radius rn by reaction products. In Stage II, the penetration can be suppressed by decreasing the penetration velocity.

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