IKA(R) M 20 Universal MillBatch mill suitable for dry grinding of hard and brittle substances..nbspDouble-walled grinding chamber can be cooled with water through two hose adapters.nbspRemovable grinding chamber easy to clean.nbspTwo grinding chambers can be alternately operated using one drive.nbspM 21 blade incl. with delivery.nbspProcess type batch .nbspOperating principle cutting/impact .nbspMotor rating input 620 W .nbspMotor rating output 260 W .nbspSpeed max. 20000 rpm .nbspCircumferential speed max. 72 m/s .nbspUsable volume max. 250 ml .nbspFeed hardness max. 5 Mohs .nbspFeed grain size max. 7 mm .nbspMaterial beater/cutter stainless steel 1.4034 .nbspMaterial milling chamber stainless steel 1.4301 .nbspPower-on time ON 7 min .nbspPower-off time OFF 10 min .nbspMilling chamber can be cooled with water yes .nbspMill feed can be cooled in milling chamber with dry ice yes .nbspMill feed can be cooled in milling chamber with liquid nitrogen no .nbspDimensions (W x H x D) 170 x