Abstract: CO2 gas was stripped from its water solution with, air in a 600 mm experimental tower filled alternately with 50mm Pall ring (having # shapped ribs), 50 mm Pall ring (having * shapped ribs) and cascade mini-ring (type I) all made of polypropylene. Liquid side mass transfer coefficients were measured and compared with those calculated from different correlations. It is found that the equations offered by Ondas et al. give moderately deviated values in comparison with the results of present investigation. It seems that Ondas shap factor atdp does not represent thoroughly the effect of shape characteristics of these new types of packings to liquid side mass transfer coefficients. A modified shape factor is proposed to replace the old one in Ondas correlation. After this modification, the application range of Ondas equation is expanded to include perforated rings (e. g. Pall ring, cascade mini-ring) as well. The new equation for calculating liquid side mass transfer coefficient becomes. The modified shape factors for various types of packings are. This equation is suited for various types of packings given above of nominal size below 50 mm.