Casting

Process:   Plastic in liquid form is poured into an open mould, which itself is often moulded from plastic.

Introduced:   Long history with traditional materials, like metals.

Plastics:   Commonly phenol formaldehyde asa  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 allow manipulation of the finished result throughout the curing process.

Uses:   Sheets, rods, tubes, jewellery, radio housings, designer furniture, and paperweights.