To predict the service life of a rubber part by calculation it is necessary to find a relationship between the varying operational loads and the material data. This is done mostly by the cumulative damage hypothesis coming from Miner. Considering the influence of temperature it is possible to predict the life expectancy of rubber specimens loaded by different signals using Miner's rule satisfactory. Using block signals, tests yield slightly higher life expectancy then those estimated by Miner's rule. Thus testing with block signals carries the risk of overestimating the lifetime of rubber parts. Using step up or step down block signals shows no influence to the lifetime.