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Controlled Atmosphere Stunning (CAS)

A more humane practice for hogs and poultry

Are you a hog or poultry processor considering a move away from electrical water bath or mechanical stunning?


Controlled Atmosphere Stunning (CAS) is used more and more nowadays to humanely stun and even slaughter animals destined for human consumption. Replacing traditional stunning methods with gas stunning improves animal welfare, reduces physical handling by slaughterhouse employees, and improves meat quality. Whether you need CO₂, nitrogen, argon, oxygen or a mix of those gases, our experts look forward to assisting you.

Pig on fence

Why Stun and/or Slaughter with Gases?

  • Improve animal welfare and reduce stress
  • Boost employee conditions, retention, and safety
  • Optimize meat quality and yield

Ask the Expert Promo

John Murphy

John Murphy

Food Application Specialist, Americas

“What should I consider when evaluating a new Controlled Atmosphere Stunning (CAS) system installation?”
The most important step is to properly size the CAS system.  As production ramps up, the system must have sufficient capacity or will have to be replaced.  Another common issue is maintaining the proper gas concentration and distribution.  The causes for this can vary from faults in the CAS system to issues with ventilation and exhaust.  Our food specialists will be there to help you address these issues before, during, and after installation.

Are you curious about CAS?

Book a free consultation with one of our experts.

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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.


Compressed argon gas and liquid argon in a variety of purities and in various modes of supply around the world thanks to our network of storage and transfill facilities.

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.

Bulk Supply

Delivered by truck and stored on your site either as a liquid in cryogenic tanks or as a gas in high-pressure tubes based on your volume, desired pressure, purity level, flow rate, and operating pattern.

CryoEase® Microbulk Solutions

A convenient and cost-effective solution for larger operations. CryoEase® tanks are available in a range of sizes. The CryoEase® service simplifies your gas supply by eliminating the need to handle cylinders, stock taking and ordering.

On-site Gas Generation

On-site gas generation helps sustainability-minded customers lower their carbon footprint, boost energy efficiency, increase throughput, enhance end product quality, and improve environmental performance.