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Plaster Casting

Plaster Casting Mold


Plaster Casting (Rubber Plaster Mold)

Plaster Casting is the process of making cast metal parts using plaster molds as the “die”.


Benefits of Plaster Casting:

The tooling process is much quicker than permanent mold or die casting tooling processes.

  • Typical first article lead time is 1-2 weeks (expedited lead times are available)
  • Tooling costs are lower than permanent mold and die casting tools


Prototype to low-volume-production quantities are possible

  •  Cost effective manufacturing/prototyping solution for quantities of 5-1,000 EAU
  • For quantities under 5, our in-house CNC machining department could also be a good fit

Smooth surface finish – typical as-cast surface roughness of Ra 63 µinch (Ra 16 µm) – very comparable to a die cast process surface finish

Exceptional part detail is possible – this process can capture detail as fine as a fingerprint in the metal casting

Thin wall capabilities

  • Typical wall thickness of .080″- .100”
  • Capable of casting as thin as .030” (.75mm) wall thickness (depending on geometry)

Parts requiring cores (both simple and complex) are easily done. Many investment cast parts can be manufactured using the plaster casting process

Simple and very complex parts are achievable

Capable of manufacturing zero draft geometries (a minimum draft angle of 1-2 degrees is preferred)

Ability to accurately simulate mechanical, thermal, and corrosion properties typically associated with a die cast process