In this paper the basic characteristics of six new compact high-performance surfaces are presented. Four are of the strip-fin type, including three stacked in a unique multiple sandwich arrangement. One of the surfaces has perforated fins formed by punching circular holes through the fins, and one has wavy fins. The basic characteristics are presented in terms of NStNPr2/3 and f versus Reynolds number. A sufficient geometrical description is provided so that the data are readily usable in heat exchanger design analysis. The triple-sandwich surface introduces some new complications in the analysis of the effectiveness of the fins, and this problem is considered in an Appendix.

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