PROCESS

EPS (expanded polystyrene) molding utilizes tiny beads of polystyrene which are expanded and aged before any molding takes place. The beads, puffed up like puffed rice, are forced into a 2-piece steam heated mold under pressure. The heat and pressure cause the beads to stick together, forming a solid but lightweight part.

RAW MATERIALS

Limited to expandable polystyrene.

TOOLING

Machined aluminum.

COST

Low piece prices but fairly high tooling cost.

ADVANTAGES

Soft lightweight parts. Good where cushioning is desirable.

DISADVANTAGES

Parts are not particularly strong. Relatively high tooling costs.

EXAMPLES

Drinking cups, protective packing & food packaging.