Phase-resolved studies by H DQ MAS NMR provided some additional insights into the weathered samples. In NR, unlike the low-field measurements, the cross-link density reduced continuously between 504 and 988 h. In the case of SBR, the cross-link density increased up to 504 h but then reduced after extended weathering with no change in the distribution of crosslinks. The most fascinating outcome of the high-field experiments was the formation of a distribution of cross-links in the blend phases, where a soft NR phase varied insignificantly in its cross-link density for entire weathering duration. A strongly cross-linked hard SBR phase remained invariant to weathering between 504 and 988 h. Via the inherent proton counting feature of NMR, it was established that the blend was relatively resistant to weathering compared to its single vulcanizates, thus making the blend an ideal choice for long-term applications.