Casting

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