they were sprayed with 130 ml of waterglass solution containing 40 8 grams of waterglass 36 u00b0 baume and encased with 120 grams of sodium tripolyphosphate ______________________________________ addition of waterglassprocess step na tripolyphosphate addition timeno g ml min sec______________________________________1 43 1 39 2 22 4 39 3 20 45 34 4 19 3 39 45 34 5 20 45 34 6 28 5 39 7 20 57 34 8 33 5 39 9 27 36 34 10 18 4 39 ______________________________________ after the last process step the test product was dried in the drying cabinet at 55 60 u00b0 c for about 60 minutes analytical data is set forth in the table of analytical results as described in example 1 there were present in a revolving drum at a pitch of 15 u00b0 and a rotating speed of 30 rpm 1 080 grams of sodium percarbonate and in the following process steps they were sprayed with 120 ml of waterglass solution containing 40 8 grams of waterglass 36 u00b0 baume and encased with 182 grams of sodium percarbonate dust ______________________________________ addition of napc waterglassprocess step dust addition timeno g ml min sec______________________________________1 43 1 39 2 30 5 39 3 20 50 34 4 42 6 39 5 20 1 39 6 29 4 39 30 34 7 20 1 39 8 19 3 39 9 23 10 1711 39 ______________________________________ after the last process step the test product was dried in a drying cabinet at 55 60 u00b0 c for about 60 minutes analytical data is set forth in the table of analytical results __________________________________________________________________________table of analytical results standard starting material test product napb napc starting napc na tripoly example example tetrahydrate material dust phosphate 1 2__________________________________________________________________________active oxygen oa 10 20 13 20 12 92 11 79.