Tensile strength and relative elongation at rupture were estimated according to GOST (State Standard) 21751 on the blade samples at a rate of movement of a mobile head of 100 ± 5 mm/min. The shearing strength was determined according to GOST (State Standard) 14759 at the same rate. To determine the degree of sealant thixotropy, the method for estima tion of the flow resistance according to GOST (State Standard) 25945 was used (full thixotropy means flu idity equal to zero).