The use of lubricants in die compaction is becoming an increasingly important issue in the P/M industry, both from an economic and environmental perspective. Until this time, the evaluation of lubricants has been limited to apparent density, tap density, and various elementary flow tests. This paper examines the application of deterministic chaos theory and fractal geometry to characterize the effects of lubricants on powder flowability. The lubricants that were investigated included zinc stearate, polyvinyl fluoride, Teflon(TM) (polytetrafluoroethylene-PTFE), and Acrawax C (ethylene bis-stearamide), ad-mixed with irregular iron powders. This paper evaluates the applicability of this new technique for characterizing powder flowability. In addition to distinguishing between the efficacy of various lubricants, data are presented on the statistical reproducibility, the effect of testing history on subsequent measurements, and the effect of machine operating parameters on the data. Parameters that can be used to describe the flow data produced by this new technique will be discussed.