Nitrogen is widely used in the plastics industry. Injection molding, film extrusion, and gas assist injection molding all use nitrogen because of its inertness and dryness. In injection molding, moisture and oxygen can cause issues with the final product including defects and blemishes. Gas assist injection molding (GIAM) involves a multi-step molding process.

GIAM uses Nitrogen as the inert gas to push the polymer from the tank to the mold and ensure it reaches all areas of the mold, completely fill it and therefore helps to reduces shrinkage. It can also be used as a propellant where a hollow part is desired in blow molding. it reduces oxidation and discoloring of the polymer. It also helps the plastic polymer stay strong.

Plastic extrusion is the process of melting raw plastic material and pressing through a die to create a long, continuous shape which may be used for piping, tubing, weather stripping, and more. Nitrogen is used to displace the oxygen and prevent damage to the equipment and final product.