What Is Beverage Grade CO2?

Beverage grade CO₂ is carbon dioxide purified to meet strict food safety standards, making it safe to carbonate sodas, beer, seltzer, and other drinks people consume directly. Unlike industrial CO₂ used for welding shields or dry ice blasting, beverage grade CO₂ has to meet specifications set out in the ISBT (International Society of Beverage Technologists) guidelines, which limit contaminants down to parts-per-billion levels.

If you’re in the food and beverage business, this distinction isn’t a technicality. It’s the difference between a product that’s safe to sell and one that gets your operation shut down.

It’s worth clearing up one point of confusion: beverage grade and food grade CO₂ are usually the same product, purified on the same line. The two names more often reflect the industry buying the gas than a difference in what’s in the cylinder. That said, the underlying standards aren’t identical—ISBT names more individual compounds than the food grade spec requires—so what actually matters is that the batch was tested against the ISBT spec and you have the paperwork to prove it.

Why Does Purity Level Matter for Beverage Grade CO₂?

CO₂ that’s carbonating a beer or soda is going directly into a product a person will drink. Any trace contaminant, even one that seems harmless in an industrial setting, can throw off flavor, create off-gassing issues, or introduce a genuine health risk. That’s why beverage grade CO₂ has to hit 99.9% purity or higher, with strict caps on things like oxygen, moisture, hydrocarbons, and sulfur compounds. 

Beverage grade CO₂ gets tested for specific impurities that don’t even show up on industrial spec sheets:

• Total hydrocarbons: they can carry off-flavors into the final product
• Acetaldehyde: a compound that can give carbonated drinks a sharp, unpleasant taste if present above trace levels
• Benzene: a known carcinogen with extremely strict limits in consumable products
• Moisture content: this affects both shelf stability and carbonation consistency

A batch of CO₂ that’s perfectly fine for inflating tires or blanketing a chemical tank might not qualify.

How Is Beverage Grade CO₂ Sourced and Purified?

Most beverage grade CO₂ starts as a byproduct of other industrial processes, like ethanol fermentation, ammonia production, or natural gas processing. Raw CO₂ captured from these sources is far from ready to be consumed. It has to go through several purification stages before it earns the beverage grade label.

The purification process typically involves compression, followed by scrubbing to remove sulfur compounds and other impurities. From there, the gas goes through activated carbon filtration, which strips out trace organics and odors that would otherwise carry into the final product. The CO₂ is then liquefied and often distilled again to hit that 99.9%+ purity threshold.

Every batch should come with a Certificate of Analysis (CoA) that documents the specific test results for that lot. If your supplier can’t produce a CoA on request, that’s a red flag, not a paperwork oversight.

What Industries Rely on Beverage Grade CO₂?

A big use case for beverage grade CO₂ is carbonating drinks: sodas, sparkling water, hard seltzers, and beer all depend on CO₂ to get that fizz and mouthfeel right.

But the applications go beyond bubbles. Breweries use beverage grade CO₂ not just for carbonation but also for purging oxygen from tanks and kegs before filling. Oxygen exposure is one of the fastest ways to spoil beer, so displacing it with CO₂ during transfer and packaging is standard practice on the production floor.

Bottling operations use it too, for purposes like:

• Pressurizing lines during filling to maintain product integrity
• Blanketing storage tanks to prevent oxidation of juices, wines, and other sensitive beverages
• Chilling products rapidly in some dry-ice-adjacent cooling applications

Restaurants and bars are also major consumers, running CO₂ tanks for soda fountains and draft beer systems. Every time a bartender pours a draft pint, beverage grade CO₂ is doing the work of pushing that beer from keg to tap while keeping it carbonated correctly.

How Do You Know If Your CO₂ Supplier Meets Beverage Grade Standards?

Ask for the Certificate of Analysis. A legitimate supplier tests each batch against ISBT guidelines and will hand over documentation without hesitation.

Beyond paperwork, look at how the supplier handles delivery and storage. Beverage grade CO₂ needs to stay isolated from contamination risks throughout the entire supply chain, not just at the point of purification. If a distributor is cutting corners on tank maintenance, delivery equipment, or storage practices, contamination can creep back in even after the gas passed its initial purity tests.

It’s also worth asking how often the supplier’s facility gets audited and what certifications they hold. Reputable beverage grade CO₂ providers typically maintain certifications tied to food safety standards, and they should be transparent about their testing frequency and audit history. If you’re getting vague answers or delayed responses, that’s your cue to look elsewhere.

Tyler O'Brien

Tyler is a results-driven marketing professional specializing in the industrial gases and equipment industry, bringing his 10 years of technical expertise and digital marketing acumen to the complex industrial gas B2B environment.