In addition abrasion of the grinding bowl and the grinding balls is examined based on the experiment series for the comparison of the grinding ball materials. Therefor elemental composition of the samples after depolymerization is determined using X-ray fluorescence analysis. The samples to be analyzed are ground to a fine powder in an agate mortar and transferred into a 2 mm high sample holder made of polyethylene with a diameter of 18 mm. The measurement is carried out with an Epsilon 4 from Malvern Panalytical.