Resin-Bonded Sand and Plaster Casting

Resin-Bonded Sand Casting

The sand is bonded by a thermosetting polymer (resin). While the mold is a comparatively thin shell, formed around a heated metal pattern, the process is referred to as shell casting. Pattern costs might be higher, but surface finish is better and tolerances are tighter.

Plaster Casting

In Table 1, the plaster mold casting refers to the processes in which a fine-grained refractory is poured as slurry over the pattern and is then allowed to set (plaster molding for nonferrous alloys) or is fired (ceramic- mold casting for higher-melting alloys). With proper control of refractory and shrinkages, complex parts can be cast with thin walls, close tolerances, and good surface finish, but at a higher cost.