NR and SBR have similar solubility parameters of about 16.7 MPa 1/2 and 17.5 MPa 1/2 respectively, making their blends technologically relevant due to macroscopic miscibility as a result of low interfacial tension. Nevertheless, they tend to exhibit phase separation on a microscopic scale due to their molecular incompatibility, and thus provide scope for potential variations in the blend phases. The low-field measurements discussed earlier suggest that NR and SBR cross-link to similar extents in the blend, as do their corresponding single vulcanizates.