Since the high-pressure gas must be injected into the product during the plastic molding process, it’s necessary to use the inert gas to prevent the oxidation reaction. The nitrogen is the safest and the most economic inert gas in the industry area.  A complete gas assist system consists of the nitrogen generator, pressurized equipment and gas assist control. The gas assist control is the key to control the gas pressure and the two essential parameters are gas injecting time (second) and gas injection pressure (MPa).