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Our solutions for inert atmospheres

Air Liquide has extensive experience in inerting that allows for controlled atmospheres with optimal gas concentrations to retain quality.

Inerting at a glance

Inert gases are used in the inerting process, which replace the oxygen in the air and prevent the formation of explosive atmospheres. The inerting process is used during blanketing, drying, purging and agitation operations, thus avoiding quality damage or reducing the risk of explosions. Some gases can also be used to pressurize pipelines to transfer products. Storage with controlled atmospheres allows products to be stored for long periods of time with optimal gas concentrations to retain quality.

Inert atmospheres are also present in the manufacture of electronic devices. In electronic component assembly, oxidation reaction, poor wettability, and high peak temperature during soldering of printed circuit boards damage electronic solder joints. To compensate for these effects, the use of nitrogen to inert the atmosphere during welding has become a worldwide accepted practice within electronics manufacturing.

Our offer

Our offering covers a wide range of solutions, including blanketing, drying, purging, agitation and more.

Inerting Applications

Nitrogen Dosage

Liquid nitrogen dosing is a unique process that helps maintain beverage quality as well as optimal shelf life. Droplets of liquid nitrogen are introduced into the packaging and canning process to help drive out air and reduce oxygen in the liquid.


Related Equipment:

  • Manifold
  • Switch Overs

Inertization of electric arc furnaces

EGAL allows cleaner metal castings to produce parts with fewer defects, better mechanical properties and lower costs.

Air Liquide's patented EGAL process uses cryogenic liquids to protect molten metal from harmful environmental components of air, such as oxygen, water vapor and carbon dioxide, during casting operations. The benefits of EGAL are derived from two main mechanisms:

  1. The process takes advantage of the vaporization of cryogenic liquid in contact with the liquid metal, producing an inert, dense, non-turbulent gaseous layer between the metal surface and atmospheric gases during the smelting cycle.
  2. The transformation from liquid to gas entails a considerable expansion in the volume of the gas (840 times more for argon and 697 times more for nitrogen) that removes or purges the oxidizing gases from the metal surface.


Related Equipment:

  • EGAL system
  • Flow Control Panels
  • Valve skids and flow control
  • Gas supply systems

Leak test with helium or hydrogen

Leak detection tests allow finding manufacturing defects and verifying the integrity of parts and systems: the defects may be related to porosities or small cracks. The objective of the tests is to determine the maximum permissible leak in the factory so that in the field it does not compromise the performance or quality of the part. Detection using a tracer gas such as Helium (He) or Hydrogen (H2), including He-Nitrogen and H2-Nitrogen mixtures, are among the most sensitive methods.

Air Liquide offers solutions for your leak testing processes, from traditional methods to alternatives tailored to your needs. These alternatives include solutions with lower concentrations of Helium, recoverers and Helium recycling systems, as well as the total substitution towards a nitrogen/hydrogen formation gas mixing system.


Related Equipment:

  • On-site mixers
  • Helium recovery systems
  • Switchover Systems

Wave Soldering

Currently, oxidation, low adhesion and high temperature spikes during PCB soldering damage the joints. To compensate for these effects, a very common practice in electronic assembly is to use nitrogen to inert the atmosphere during the soldering process. The nitrogen atmosphere improves the adhesion of the solder, reduces the degree of oxidation and accelerates the speed of the process.

ALIX for Wave Soldering from our Nexelia line is a total upgrade solution to generate and maintain an inert atmosphere during the wave soldering process. It adapts to your specific needs, combining the best of our gases, technology and expert support. We work closely with you to pre-define the results according to the nature of your processes and equipment.


Related Equipment:

  • ALIX Inerting Hood-E

Reflux Soldering

Currently, oxidation reactions, poor wettability and high temperature peaks in reflow soldering can damage the soldered electronics joints. To compensate for these effects, the use of nitrogen to inert the atmosphere during soldering has become a globally accepted practice in electronic assembly. Nitrogen atmospheres improve weld wettability, reduce the degree of oxidation, and accelerate the rate of the welding reaction.

A thoroughly modern solution, NexeliaTM Reflow Soldering was designed by the experts at Air Liquide to carefully generate and monitor the inert atmosphere entering your reflow oven. The solution combines nitrogen supply with an automated control system that automatically adjusts the inert composition of the atmosphere in the reflow oven.

NexeliaTM for Reflow Soldering was designed for sectors within the electronics manufacturing industry that use reflow soldering processes.


Related Equipment:

  • Atmosphere Controller-E

Why choose us

  • Industry Leader

    We are a world leader in gases, technologies and services for Industry and Health.

  • Expertise

    We have a global network of experts available to help you develop solutions that meet your specifications and challenges.

  • Extensive infrastructure network

    We own and operate several gas production and filling facilities

  • Reliability

    Our solutions are reliable, reproducible and comply with strict and constantly evolving regulations.

  • Focused on quality

    We strive for absolute quality control of processes and products, and our products meet and exceed industry standards.

  • One-Stop Solution Provider

    We offer a full range of products in various purities and modes of supply and a range of services to meet your specific needs.

  • Sustainability

    With a strong commitment to climate change and the energy transition, our solutions are developed to achieve the highest performance in your applications and reduce your environmental impact.

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