A calculation according to predict the long-term strength and fatigue of structural polymeric materials (PCM) with continuous loading znakopostojannom (Form cycle of stress – a triangle) and a constant temperature, which use the original characteristics of the material produced on the basis of only short-term tests under normal conditions. Recommendations for an approximate assessment of the required values for the calculation of the limits of long-term strength and endurance in the absence of experimental data for analogues icsleduemogo material. When predicting fatigue RMB considered particularly mechanical behavior of materials, reflecting the stress-strain diagram with short-term loading. The possibility of using the developed method of accelerated durability prediction is confirmed by the results of long-term static and cyclic tests of various types of RMB.