Determination of degradation resistance of rare-earth metal-containing magnet involves determining m

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The present invention relates to a method for determining the degradation stability (D) of a rare earth metal-containing magnet (4) is characterized by the following steps : -determining the moment m 0 a magnet (4) at the time t 0, -introducing, preferably immersing, a magnet (4) in a reaction medium (5), -removal of the magnet (4) from the reaction medium (5) according to a designated reaction time t, -drying of the magnet (4), -determining the moment m 1 of the magnet (4) at the time t 1, and -determining the degradation stability (D) according to the following formula : [%] = 100-D (100 · m 1/m0).