Carbon Dioxide Gas
CO 2 GasCarbon dioxide (CO2) is one of the most widely used industrial gases in the Iranian market, with applications ranging from producing carbonated drinks to providing shielding gas for steel welding. As a leader in this field, Bonyan Gas supplies this gas in industrial, food and laboratory grades, fully compliant with international standards. Since the product is supplied only for professional and industrial use, accurate supply requires specialist knowledge of the grades and the buyer’s end use.
Carbon dioxide gas purity grades
Choosing the right gas grade directly affects process quality and the total cost of each project. In fact, not all industries need the same level of purity: laboratory processes and the food industry require precise impurity control, while general industrial and welding applications achieve the desired result with more economical grades. For example, grade 3.5 is recommended for processes such as beverage carbonation or laboratory use, while grade 2.5 is fully adequate and more cost-effective for welding and general industrial use.
Grade 2.5
Grade 3.5
Specifications Table
| Molecular formula | Molecular mass | Color | Odor at low concentration | Odor at high concentration | Taste | Gas density | Sublimation point | Density relative to air | Solubility in water | Flammability | Toxicity | Toxicity at high concentration | Gas group |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CO₂ | 44g/mol | Colorless | Odorless | Pungent and acidic | Sour | 1.98g/L | 78.5°C- | 1.53 | 0.9vol/vol | No | Non-toxic | Asphyxiant property | Inorganic oxide |
Technical note: solubility of “volume per volume” means that at standard room temperature and pressure, about 0.9 liters of carbon dioxide dissolves in every 1 liter of water; this solubility decreases as temperature rises or pressure falls.
Technical note: carbon dioxide does not melt at atmospheric pressure; instead it changes directly from solid (dry ice) to gas (sublimes). For this reason, the term “sublimation point” is used instead of “melting point” for this gas. Also, because it is denser than air, it always collects in low areas of enclosed spaces; following safety rules and ventilating these spaces is therefore vital to prevent breathing hazards.
Supply and delivery method
Carbon dioxide gas is supplied in industrial, food and laboratory grades and in a variety of volumes to suit your use. For organizations with continuous consumption, such as beverage production lines or high-volume welding workshops, periodic and scheduled supply is available to prevent any interruption in production. Fast supply and shipping are also available for one-off orders; note that the purity and authenticity of every shipment are carefully tested and guaranteed before delivery.
If you are looking for a complete cylinder (not just gas supply), see the specifications and volume selection guide. For tank/cylinder specifications: Buy a ready carbon dioxide cylinder ↗
Yes, if you need a complete cylinder (full or exchange), you can order from the gas cylinders page or contact our experts directly.
The main difference is purity and production standards. Food-grade CO₂ is produced under stricter quality controls and is suitable for contact with food and beverages.
Grade and purity, order volume, type of use (industrial/food/laboratory) and market conditions are the main price factors. For an exact, up-to-date price, contact our sales experts.