This International Standard describes a method for the determination of the resistance of vulcanized rubbers tofatigue under repeated tensile deformations, the test piece size and frequency of cycling being such that thereis little or no temperature rise. Under these conditions, failure results from the growth of a crack that ultimatelysevers the test piece.The method is restricted to repeated deformations in which the test piece is relaxed to zero strain for part ofeach cycle. Analogous fatigue processes can occur under repeated deformations which do not pass throughzero strain and also, in certain rubbers, under static deformation, but this International Standard does not applyto these conditions.