Castable

Castable is an adjective used to describe materials or patterns that can be formed by casting. In manufacturing, a castable material is one that can be melted or softened and poured or injected into a mold, where it solidifies to take on the shape of the mold once cooled or cured. Castability depends on properties such as fluidity during melting, melting or softening temperature, shrinkage upon solidification, and compatibility with the mold material.

In metalworking, castable materials include metals and alloys designed for melting and pouring into molds (for example, sand, investment, or die casting). A high degree of castability is associated with good fluidity, controllable shrinkage, and a low tendency to produce defects like porosity or cold shuts. Castable metals range from common aluminum and brass alloys to higher-value alloys used in precision applications.

In dentistry and jewelry, castable materials are used to create wax patterns or direct patterns that are converted into metal restorations or components through investment casting or lost-wax processes. Castable waxes and castable resins are formulated to burn out cleanly in the mold, leaving a precise mold for metal casting or for 3D-printed pattern generation.

In contemporary manufacturing, castable resins and polymers are used in investment casting and rapid prototyping to produce metal parts with complex geometries. They are valued for dimensional stability, surface finish potential, and process compatibility with subsequent casting steps.

See also: casting, investment casting, lost-wax casting, die casting.