Carbon dioxide (CO2) is a liquefied, colorless gas that can asphyxiate in high concentration.
Carbon dioxide has many wellknown applications in the food and beverages industry – from carbonating drinks to modifying atmospheres for packaged foods.
Dry ice – or solid CO2 – is growing in popularly as a cryogenic refrigerant in mechanical refrigeration systems due to its environmental benefits. Dry ice is also an externally effective and environmentally sound cleaning agent.
The non-flammable properties of CO2 make it a popular pressurizing gas for everything from aerosols through fumigants to air guns. It has many other uses – including as a component of medical reanimation mixtures, a neutralizing agent for pH control, an Inerting agent for mild steel welding, a replacement for blasting powder in quarrying and mining operations in compressed form and a blasting agent in solid form.
Carbon dioxide is used on a large scale as a shield gas in MIG/MAG welding, where the gas protects the weld puddle against oxidation by the surrounding air. It is also used in the manufacture of casting molds to enhance their hardness.