“…Figure 1 presents RBS spectra of He + ions from the initial and modifi ed rubber of grade 7-V-14. Computer modelling of the RBS spectrum from the specimen of the initial rubber (see Figure 1, curve 1) made it possible to establish [7] The peaks over the steps on the spectrum in the region of signals from O, S, Ca, and Zn atoms (see Figure 1, curve 1) indicate their increased concentration in the surface layers of the rubber investigated. The increased content of S, Ca, and Zn can be attributed to the wellknown "blooming" of sulphur and zinc oxide on the surface of the vulcanisate [8].…”