Discussion
In slip casting, the plaster mould forms a cast layer by
Answer: A
Correct answer: drawing water out of the slip by capillary suction
The fine pores of the plaster exert a suction that pulls water out of the slip at the mould face, leaving the ceramic particles behind as a consolidating layer. Nothing is heated and nothing reacts; the driving force is capillarity, and the process stops when the plaster is saturated, which is why moulds must be dried between casts.
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