Definition of Gas-Assisted Injection Molding Gas-assisted injection molding is a manufacturing process that uses inert gas to apply internal pressure inside a molten plastic part during the plastic injection molding process . This results in hollow, lightweight parts with thick walls and uniform thickness. Gas-assisted injection molding includes four basic steps: Molten plastic is injected into a mold cavity under high pressure, filling most but not all of the cavity. Once the plastic has partially solidified, an inert gas such as nitrogen is injected into the still-molten core of the part. This gas gets injected through the injection nozzle into the mold's hollow section called the gas channel. The gas applies outward pressure from inside the part, pushing the plastic against the walls of the mold cavity. It helps pack out the part and eliminate sink marks. The part continues cooling, with the gas pressure holding the plastic against the mold walls. The result is a robust, light
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