Within the limits of the given research tests of cyclic durability and durability, and also residual durability of samples from fiberglass and organoplasty are conducted at the normal and raised temperatures. Research of mechanisms of destruction of unidirectional fibrous plastics is carried out at cyclic and static load ring samples within the limits of realisation of a so-called NOL-method. Experimental dependences of residual durability on intensity preliminary cyclic load are received, constructed experimental functions damage for investigated materials at the room and raised temperatures.