The authors proposed and experimentally verified a new method of measurements of thermal conductivity and thermal diffusivity of homogeneous and isotropic materials with thermal conductivities of <2 W · m −1 · K −1 . The theoretical model and the experimental arrangement of the method, referred to as the modified dynamic plane source method, are described. The influence of the floating temperature of the heat sink was analyzed and included into the evaluation. The method was both theoretically and experimentally compared with other transient methods, namely, transient plane source and extended dynamic plane source methods. Two different polymethylmethacrylate materials were measured at laboratory temperature using all three methods, obtaining results with coefficients of variation of <2 % and 5 % for the thermal conductivity and thermal diffusivity, respectively. In addition, the sensor calibration and the sources of measurement uncertainty are outlined.Keywords Modified dynamic plane source method · Polymethylmethacrylate · Thermal conductivity · Thermal diffusivity · Transient plane source method

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