10 2 9 0oxygen after 10 days at 30 u00b0 c and 92 9 rel humidityparticle fraction employed lt 0 4 u2192 0 315 lt 0 4 u2192 0 315 lt 0 4 u2192 0 315 lt 0 4 u2192 0 315 lt 0 4 u2192 0 315mm as nuclei__________________________________________________________________________ in examples 1 to 4 different mixture ratios of sodium percarbonate and sodium perborate were specified under the term 34 sodium perborate 34 in this application there is meant as is customary the tetrahydrate with increasing content of sodium perborate to be used the solubility time increases but the stability in moist atmosphere also increases as described in example 1 there were present in a rotating drum under an angle of inclination of 15 u00b0 and 30 rpm 700 grams of per salt having a particle size of lt 0 4 mm in each case 1 5 of 559 grams of a solution solution i which contains 5 grams of sodium hexametaphosphate 90 7 grams of soda sodium carbonate 14 4 grams of soidum metaborate and 30 5 grams of waterglass solution of 38 u00b0 be were mixed together with 13 6 grams of hydrogen peroxide solution containing 70 weight hydrogen peroxide solution ii according to example 1 before spraying the thus produced spray solution in a first process step was sprayed through a binary nozzle on the particles in the rotating drum the sprayed product was subsequently dried for about 1 hour at 55 u00b0 60 u00b0 c in a drying cabinet process steps 2 to 5 were carried out according to process step 1 as can be ssen from table 2 the composition of the final.