Longer casting time and higher slip density results in the reduction of water content in the cast piece. The water content of the cast produced is not affected by ageing the slip.
The formation of the cast in a plaster mould may be regarded as due to filtration of water out of the slip, the suctional force of the capillary being the effect of the surface tension of water. The most desirable properties in a casting slip can be ensured by selecting a mixture of coarse, medium and fine particles which results in obtaining maximum packing density. Viscosity measurement in slips is more important for control of casting.
To be Contd……..
