The influence of reaction conditions (temperature, catalyst type, catalyst concentration - represented as molar ratio catalyst/acetone n(c)/n(a)) on the composition of the product formed from the reaction of acetone and hydrogen peroxide (30%) under acid catalysis was studied. 3,3,6.6,9,9-Hexamethyl-1,2,4,5,7,8-hexoxonane (TATP) was found to be the major product when the content of the catalyst in the reaction mixture is low (n(c)/n(a) <= 0.5). A single side product (peak 10.2) in an amount ranging from 1.5 to 8% of the total peak area was present in all the prepared samples. Three other side products were found when catalyzing by hydrochloric and nitric acids. Temperature and catalyst type did not have a significant influence on the composition of the product at low catalyst concentration. Increasing the catalyst concentration led to he formation of 3,3,6,6-tetramethyl-1,2,4,5-tetroxane (DADP) either as a co-product of TATP or as an exclusive product depending on the concentration of the catalyst.