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The wettability of borsilicate and soda-lime soft glasses was studied by measuring critical surface tensions (CST) of the glasses and taking scanning electron micrographs (SEM) before and after various treatments: etching with hydrogen chloride gas, silanization, impregnation withs urface-active agents, and combinations of these. Considerable increase in CST values was found after etching of the soda-lime glass, and this effect could be explained by a geometrical model of the surface. The CST values, together with the surface tensions of a series of gas chromatographic stationary phases, can help in the preparation of glass capillary columns, as was illustrated by SEM micrographs of coated internal surfaces of capillary columns.