The terms food grade and beverage grade get used interchangeably in casual conversation. They are not the same specification. The distinction matters if you are purchasing CO₂ for any application where it contacts consumable products.
Food Grade CO₂
Food grade CO₂ is defined by the FDA under 21 CFR 184.1240. It must be at least 99.5 percent pure. The regulation covers broad categories of contaminants but does not set specific limits for many trace compounds. Food grade CO₂ is used for modified atmosphere packaging, flash freezing, and other food processing applications where the CO₂ does not directly enter the final product.
Beverage Grade CO₂
Beverage grade CO₂ follows the International Society of Beverage Technologists (ISBT) specification. This is significantly more stringent. Purity must be 99.9 percent or higher. Total sulfur must be below 0.1 ppm. Benzene must be non detect. Acetaldehyde below 0.2 ppm. Total hydrocarbons below 20 ppm. The full spec covers over 20 individual parameters.
Beverage grade CO₂ goes directly into drinks. It is the carbonation in your soda, beer, sparkling water, and draft beverages. Any contaminant in the CO₂ ends up in the product consumers drink. That is why the spec is strict.
The Gap Between Them
Going from food grade (99.5 percent) to beverage grade (99.9+ percent) requires removing contaminants at the parts per million and parts per billion level. This is the difference between adequate and exceptional purification. Many CO₂ sources can meet food grade without much difficulty. Beverage grade is where most fall short.
The compounds that typically cause problems are trace hydrocarbons, sulfur compounds, and aromatic organics like benzene. These require specialized purification stages that go beyond standard drying and bulk cleanup. Getting them to non detect levels consistently is the technical challenge.
Why It Matters for Buyers
If you are buying CO₂ for beverage carbonation, you need to verify that your supplier is testing to the ISBT spec, not just FDA food grade. Ask for third party lab results. Ask which parameters they test for. Ask how frequently they test. A supplier that only certifies to food grade may be delivering product that does not meet beverage grade thresholds on trace compounds.
At CleanCycleCarbon, we produce exclusively to the ISBT beverage grade specification. Every batch is tested by an independent ISO 17025 accredited laboratory. We do not sell food grade product because our system is designed to exceed the higher standard from day one.
