Rubbers are widely used as sealing material in various applications. In many fields the function ofseal materials at low temperature is required. Therefore the understanding of failure mechanism that lead to leakage at lowtemperatures is of high importance. Therefore the lower operation temperature limit of rubber seals should be determined in dependence of the material properties. The results of differential scanning calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) are compined with results of standardized measurements as the compression set according to ISO 815. To reduce the test time of the standard tests a faster and more efficient technique was developed and applied. In addition the breakdown temperature of the sealing function of O-ring seals at low temperaturesis measured in a component test setup in dependence of the material and the degree of compression.