Carbon dioxide
CAS 124-38-9
EC 204-696-9
Formula CO2
MW 44.01 g/mol
Inorganic Acids Food & NutritionOil, Gas & EnergyWater TreatmentPharmaceuticals & Healthcare Flavoring & AcidulantpH Regulation & BufferingPreservation & Biocide
Description
Carbon dioxide (CAS 124-38-9), also known as CO2, E290, R 744, and dry ice in its solid form, is an inorganic gas produced through combustion, fermentation, and industrial synthesis. It is classified under EC 204-696-9 and carries the HS code 28112100.
In carbonated beverages, CO2 dissolves under pressure to form carbonic acid, lowering pH and delivering characteristic effervescence. In water treatment, it replaces mineral acids for pH correction, reacting with hydroxide ions without introducing chloride or sulfate residues. In modified atmosphere packaging, it inhibits microbial growth by suppressing aerobic respiration.
Carbon dioxide is available in food-grade (E290), pharmaceutical-grade (Ph.Eur.), and technical-grade specifications, supplied as a compressed gas in cylinders or as liquefied bulk. It complies with REACH regulation and FCC standards where applicable. Procurement in Europe typically follows EN 13900 or equivalent purity specifications.
In carbonated beverages, CO2 dissolves under pressure to form carbonic acid, lowering pH and delivering characteristic effervescence. In water treatment, it replaces mineral acids for pH correction, reacting with hydroxide ions without introducing chloride or sulfate residues. In modified atmosphere packaging, it inhibits microbial growth by suppressing aerobic respiration.
Carbon dioxide is available in food-grade (E290), pharmaceutical-grade (Ph.Eur.), and technical-grade specifications, supplied as a compressed gas in cylinders or as liquefied bulk. It complies with REACH regulation and FCC standards where applicable. Procurement in Europe typically follows EN 13900 or equivalent purity specifications.
Physical Properties
| Melting Point | -79 °C (sublm) |
| Boiling Point | -78.5 °C |
| Density | 0.79787 g/cm³ (liquid) @ Temp: 50 °C; Press: 1.58 x 10⁵ Torr |
| Appearance | Carbon dioxide is a colorless, odorless, noncombustible gas. |
| Color | colorless |
| Odor | at 100.00?%. odorless |
| Form | colorless gas |
| Water Solubility | mL CO2/100mL H2O at 760mm: 171 (0°C), 88 (20°C), 36 (60°C) [MER06] |
| Vapor Pressure | 56.5 atm ( 20 °C) |
| Refractive Index | 1.0004 |
| Log P | 0.830 (est) |
Safety & Handling (Learn More)
Warning GHS04 GHS07
H
H280H281H336
P
P261P271P282P319P403P405P501P304+P340P336+P317P403+P233P410+P403
Trade & Regulatory
| HS Code | 28112100 |
| UN Number | 1013 |
| ADR Class | 2.2 |
| Storage Class | 2A - Gases |
Other Names
CO₂CO2E290R 744DRY ICEaerfixusafter-damp
Related Products
Raw Materials
Need a chemical? Get a quote within 24 hours.