1. The effect of reactive type antioxidant, G-1 in comparism to ordinary antioxidant, SP, which are used for NR and SBR has been studied, and its recipes are equal. The effects against ozone have been shown that in ordinary antioxidant, SBR, no any particular effect both for NR and SBR was found, where as in reactive type, considerable influence was recogniged particulary in dynamic ozone test. 2. The influence of reactive antioxidants on velcanization has been studied by means of Mooney viscometer and Rheometer. 3. The ageing properties of vulcanizates containing reactive antioxidant have been studied in terms of tensile strength.