The yield of the experiments with 6 % acid content is shown in Figure . The mean results with the standard deviations of the oligomers and the solid residue are shown. between 15 min and 20 min is particularly striking. A possible explanation is the complete amorphization of the samples, which increases solubility or the formation of oligomer chains that are short enough to become soluble in water. Amorphization itself can be ruled out based on previous results. The influence of the acid content on the mechanocatalytic partial depolymerization is investigated with an acid content of 3 %. Figure shows the yields with the corresponding standard deviations for an acid content of 3 %. Compared to the experiments with 6 % acid content, the proportion of oligomer is lower for the same grinding time. After 30 min, the oligomer fraction is 56 % with 6 % acid content and 42 % with 3 % acid content. This is due to the higher amount of catalyst, which accelerates the reaction. It is observed that the glucose yield (Figure ) increases at 6 % acid content and a grinding time of up to 45 min. What is striking is the initially small increase in yield, which increases up to 45 min. The reason for this is the presence of longer cellulose chains on average with shorter grinding times, which is reflected in the lower soluble fraction of the samples. When the grinding time increases, more cellulose chains with a lower degree of polymerization are formed. This, in turn, statistically leads to more cleavages at the chain ends, which lead to the formation of glucose.