In the silica-filled NR/BR compounds, we judged
that 1.0 phr nano-ZnO was suitable for reducing the
amount of zinc, which was the goal of this study.
Accordingly, 1.0 and 0.1 phr were the most appropriate
contents of nano-ZnO and stearic acid, respectively.
In addition, the use of nano-ZnO enabled a
reduced t90 and improved mechanical properties.