The melted plastic in contact with the mold walls begins to solidify, then nitrogen gas is injected into the mold through strategically designed and placed gas inlets, providing pressure that pushes the plastic into the mold extremities.

The path of the bubble is controlled by taking the path of least resistance through the hottest, least viscous plastic, which keeps it centered from the colder walls of the mold.

[2] This process forms hollow parts that are cheaper than traditionally injection molded equivalents.

Molded parts also cool faster in this process.

Clear or transparent plastic materials are an inappropriate option for this technique as the cosmetic-appearance can deteriorate.