This category comprises bodies from which a castable mud can be produced by adding water and various liquefying additives, for shaping in plaster casts. The clay minerals may, depending on their chemical composition, porous earthenware that can be fired at temperatures of 1000-1500 ºC, or vitrified clay masses that are fired compact at around 1200 ºC, in various fired colours. The liquefiability of a mass is affected by its mineral composition and particle size – these vary by mass therefore all casting masses can be liquefied in different ways. Please consult the recommended liquefaction instruction!