The surface tension of the binary refrigerant mixture dimethyl ether (RE170)(1) + propane (R290)(2) at three mass fraction of w(1) = 0.3007. 0.4975 and 0.6949 was measured in the temperature range from 243 to 333 K with a differential capillary rise method. The uncertainties of the measurement of the temperature and the surface tension were estimated to be within +/- 10 mK and +/- 0.2 mN m(-1). respectively. A correlation for the surface tension of the binary refrigerant mixture RE170 + R290 was developed as a function of the composition. (C) 2010 Elsevier B.V. All rights reserved.