Discussion
Plaster of Paris is used for slip casting moulds chiefly because it
Answer: B
Correct answer: has fine pores and absorbs water readily
Set plaster is a mass of interlocking gypsum crystals with a fine, connected pore structure, which gives it both the capillary suction to draw water and the capacity to hold what it draws. It is also cheap, easily cast to shape from a model, and slightly soluble, which helps release. It is certainly not hard, and its softness is why a mould lasts only a hundred casts or so.
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