Nitrogen is the sixth most common element and makes up about 78% of the Earth's atmosphere. It possesses two key characteristics that make it the world's most widely used and versatile industrial gas. Nitrogen is almost inert and when liquefied it is intensely cold. It boils at-195.8°C.
This makes liquid nitrogen a highly effective, versatile and non-polluting agent for freezing and chilling. Under normal conditions nitrogen is chemically inactive. An atmosphere of nitrogen is like a blanket that prevents most reactions and combustion from taking place.
Until the 1960's nitrogen was generally considered a useless by-product of oxygen extraction. Today it is the fastest growing gas, with an ever-expanding range of application
Key Properties: Relatively inert and non-combustible, intensely cold in liquid phase
- Gas and vapor displacement for explosion and fire suppression.
- Inert atmospheres for tanker and pipeline purging, for electronics, chemicals, glass and steel manufacture.
- Controlled atmospheres for heat treatment, nitrating, silo atmospheres and food packaging.
- Freezing, chilling and transporting foods.
- Tissue freezing and storage.
- Contraction of metals (shrink fitting).
- Cooling agent for mounding, film extrusion and process equipment.
- Chemical reagent and reagent carrier.
- Cooling agent for cryosurgery.