DAKCAST M 12 (Magnesia based castables) DAKCAST M 12 is a cement free magnesia based vibratable castable, uniquely designed to produce special shapes for tundishes. Target boxes, impact pads, dams, weirs, baffles, nozzle cones, well blocks are manufactured with superior physical and chemical properties for safe casting and clean steel production. DAKCAST M 12 uses a special binder that allows the material to be cast with minumum requirements of water and curing time in the mold is minimized by the effect of the binder.