Using data from a previous paper1) and such physical properties of organic reagents as melting point, boiling point, density, molecular weight and refractive index, as obtained from handbooks, the relationships between physical properties and the inhibiting effects of various organic reagents on the dissolution of aluminum in 1,1,1trichloroethane (CCl3CH3) were subjected to correlation analysis, and the choice of inhibitor was investigated from the standpoint of physical properties.