The two roll mills had the following dimensions: diameter 25 cm and length 75 cm. Computer software was used for controlling the mixing conditions and storing data. The Banbury mixer and two roll mills were equipped with cooling system. The compounds formulations were summarized in Table I. The temperature variations of some carbon blackand silica-filled rubber compounds with CBS or TMTD as a function of mixing time are shown in Figure 1. The lowest and highest temperatures during mixing were 50–96C, respectively