The milling behavior of brominated isobutylene-co-paramethylstyrene (BIMS), ethylene propylene diene terpolymer (EPDM), and their blends was investigated over a range of temperatures and friction ratios using the continuous milling operation. At 30 degreesC, BIMS forms a loose nervy appearance and, as the temperature is increased to 90 degreesC, it gradually forms a tight elastic band. EPDM forms a loose band at all temperatures and friction ratios studied. For different blends of BIMS and EPDM, the milling behavior changes from a tight elastic band to a loose bagging band on increasing the EPDM content. Addition of different fillers results in lowering of the tendency to go to the back roll, even at lower temperatures. In all the filled systems, a smooth, regular, and tight elastic band is obtained at all the temperatures and friction ratios studied.