The physical – mechanical characteristics of powders of monosize electrofused corundum with fraction F240, produce by “RUSAL Boksitogorsk” JSC (Russia) and F240 Alodur WSK, ZWSK, and SWSK produced by Traibacher Schleifmittel (Austria) are determined. The effect of the shape of grains in the electrofused corundum on the open porosity, permeability, and ultimate strength of the porous permeable ceramic is studied. The quantitative interrelation between the ultimate strengths under normal, diametral compression and bending of samples of porous permeable ceramic made from the electrocorundum powders is determined.