700 800 and 900 parts filler fillers may be used here individually or in a mixture besides the pale coloured fillers the products of the invention may also contain other fillers used in the rubber industry most preferably industrial carbon blacks these include furnace gas thermal and flame blacks with an iodine adsorption value of from 5 to 1000 m 2 g a ctab value of from 15 to 600 m 2 g and a dbp value of from 30 to 400 ml 100 g these ranges include all values and subranges therebetween including respectively 10 20 50 100 200 300 400 500 600 700 800 and 900m 2 g iodine adsorption value 20 40 60 80 100 200 300 400 and 500 m 2 g ctab value and 35 40 45 50 55 60 65 70 75 100 200 and 300 ml 100 g dbp value preferably the other filler level in the product may be from 5 to 1000 parts by weight based on 100 parts of the product this filler level being added to the filler level of the pale coloured fillers this range includes all values and subranges therebetween including 10 20 40 60 80 100 200 300 400 500 600 700 800 and 900 parts by weight based on 100 parts of the product both in the case of the pale coloured fillers and in that of the carbon blacks it is preferable to take the fillers at an early stage from their preparation process and introduce them into the preparation of the rubber powder the process of the invention preferably includes the preparation of rubber powders pellets which contain silicatic and or oxidic fillers without hydrophobicization of the filler by.