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Injection or Blow Molding

High pressure nitrogen for meeting high pressure demands

Plastic producers are under ever increasing pressure to increase quality while decreasing costs. Gas Assist Injection Molding (GAIM) can help you meet both demands by allowing you to decrease your plastic usage while ensuring a more consistent product quality and wall thickness—all with an aim to maximize your process efficiency. Liquid nitrogen can also be used in the blow molding process instead of cooled air to help increase quality and productivity in the process. In some cases, liquid carbon dioxide can be used for temperature control and cooling hot spots in the molding process.
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Higher Quality, Decreased Costs

Adding GAIM to an injection molding process can have wide-ranging benefits across your operation. From increasing your product quality to decreasing your plastic weight, learn how GAIM can help you do more with less:

GAIM can help increase:

  • Part strength and rigidity
  • Design freedom
  • Oxidative resistance
  • Wall thickness uniformity
  • Overall quality by reducing sink marks

GAIM can help decrease:

  • Machine size and energy use
  • Cycle and cooling time
  • Part weight
  • Plastic usage

Why Nitrogen?

A common question is "Why should I use nitrogen for GAIM instead of pure air?"  Here is a sample of some of the benefits that nitrogen usage provides over air usage:

Some polymers can experience quality problems due to oxidation that occurs  at high temperatures and pressures required for injection molding. Inert nitrogen eliminates oxygen and reduces the opportunity for oxidation.

Injection molding with nitrogen can help to reduce splay and other defects caused by moisture and oxygen that are sometimes exhibited when using  air in the injection molding of plastics.

Liquid nitrogen can be pumped to a high pressure more cost efficiently than air can be compressed to a high pressure. This can help to reduce capital on air compressors and help reduce overall energy expenditure.

Questions? We've got answers.



Air Products gases, typically provided in gaseous and liquid form, enable customers in a wide range of industries to improve their environmental performance, product quality, and productivity.

Carbon Dioxide

Our experienced applications teams across the globe can use their industry and application knowledge to provide you with a compressed or liquid carbon dioxide supply and technology solution to meet your unique needs.


Useful as a gas, for its inert properties, and as a liquid for cooling and freezing. Virtually any industry can benefit from its unique properties to improve yields, optimize performance and make operations safer.