Process: Plastic in liquid form is poured into an open mould itself often moulded from plastic
Introduced: Long history with traditional materials, like metals
Plastics: Commonly phenol formaldehyde as liquid resin, polymethyl methacrylate, and polyurethane
Marks: Frequently trapped air bubbles, or their remains on the surface
Tooling cost: Low
Production volume: Low, essentially a craft process; objects can be placed in the liquid as it solidifies; the cast form can be carved; open casts allows manipulation of the finished result throughout the curing process
Uses: Preformed shapes: sheets, rods, tubes; jewellery; radio housings; designer furniture; paperweights