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.
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.