Process: There are a number of different processes but they share the release of air/gas into the plastic so that it fills with bubbles and foams within a two part metal mould of the desired shape
Introduced: Post World War 1
Plastics: Most, especially polystyrene, polyurethane, polyvinyl chloride
Marks: None
Tooling cost: Medium
Production volume: High
Uses: Packaging; sponges; soles of shoes; steering wheels; vending cups, insulation; foam furniture