The purpose of the research is to determine the efficiency of various modifiers for increasing the re-sistance of rubber products to the effects of ozone contained in the air, under a long-term storage of agri-cultural machinery in open areas during the off-season. The task of the research is to determine the pro-tective properties of rubber modifiers under the conditions of the destructive effect of ozone. Experimental investigations were carried out in the ozone chamber OMS-1 using standard techniques. Ozone aging was carried out consistently in three stages respectively with stretching samples at 20, 30, 50 %, the duration of each stage of the experiment - 6 hours. After each stage of the tests, visual inspection of the samples was carried out. The ability of a deformed sample to resist the destructive effect of ozone was determined by the time of appearance of the first cracks visible to the naked eye on the surface of the sample. The results of the data obtained during the experiment showed that the introduction of the modifiers «Stillage bottoms of telomeric alcohols» and «Fluorine paraffins» into the rubber of the brand NO-68-1B-1 (from BNKS-18A rubber) already at the first stage of testing leads to the appearance of a continuous mesh small cracks on the samples surface. On samples from this rubber, subjected to surface fluoridation at the last stage of the test, a number of edge cracks up to 11 mm in length and up to 1 mm deep are appeared. On samples from the rubber of grade 26-82-4 (from SKEPT-50 rubber), the pointed cracks appear on rubber samples, and the modification of this rubber with the composition «Stillage bottoms of telomeric alcohols» accelerates this process. The experimental samples of rubber IR-5-1, as modified and as subjected to surface fluorination, have withstood the ozone aging test without traces of destruction. The results of the conducted studies allow us to conclude that it is necessary to develop new protective compositions that exclude the destruction of rubber technical products of agricultural machinery during long-term storage in open areas.
