The article deals with the condensation of multi-material mixtures on the basis of the film model. The analysis of the material transport and the interaction between the mixture components in the gaseous phase are founded on the Maxwell-Stefan equations. Beside the exact solutions of these equations, some solutions of approximation were taken into consideration, too, and tested in experiments. The complete article will be published in the journal Forsch. Ing.-Wes.-Eng. Res 62 (1996). Part 1 in No. 1/2-96, Part 2 in No. 3-96 and Part 3 in No. 4-96.