Double-roller mill. The doubel-roller mills can be used to crush brittle materials such as ore, slag, glass, ceramics, battery materials, limestone, … up to a Mohs hardness of approx. 8.5. ... AUSTRALIA. SIEBTECHNIK TEMA Pty. Ltd. 19 Fitzpatrick Street Revesby NSW 2212 P.O. Box 363 Milperra NSW 2214. Tel.: +61 29792 3555