of a pipette after the storage time had elapsed and the time taken for the drop to be adsorbed was determined the results are shown in table 1 and table 2 to test the adhesive pull strength the slabs coated with the renders from the examples or comparative examples were after the four week storage time had elapsed stored for 5 years in the open at an erection angle of 60 u00b0 c and in a south west alignment part of the coated slabs about 15 of the area was protected from the direct action of precipitation by means of a hood of aluminum sheet placed over the upper end face of the slab after the 5 years of exposure had elapsed the adhesion of the covered and the uncovered gypsum render was determined for this purpose 6 test specimens were cut by means of a drill fitted with a circular cutter diameter 55 mm from each of the covered and uncovered parts of one slab one day before the testing date pulloff brackets were then adhesively bonded to the test specimens using a 2 component adhesive the adhesive pull strength was determined in accordance with din 18156 using a pull off apparatus from herion using a loading rate of 250 n s the mean values for the adhesive pull strength of the individual trails are shown in tables 1 and 2 table 1__________________________________________________________________________ ex 1 ex.