High-purity nitrogen is a common high-purity gas， its almost inert diatomic gas， chemical properties are extremely inactive， gas molecules are also larger than oxygen molecules， not easy to thermal expansion and contraction， deformation is small， the application of the scope of this is very broad.

Main uses: fertiliser， ammonia， nitric acid and other compounds manufacturing， inert protective medium， frozen food， low-temperature crushing， such as refrigerants， coolants， electronic industrial production of epitaxy， diffusion， chemical vapour phase precipitation， ion implantation， plasma dry engraving， photolithography， etc.， high-purity nitrogen is also used as a standard gas， calibration gas， zero-point gas， equilibrium gas， and so on.

At the same time， high purity nitrogen is used in tyres， its leakage of the tyre wall is about 30-40% slower than air， which can maintain stable tyre pressure， improve the stability of tyre driving， ensure the stability of driving， and ensure the comfort of driving， the audio conductivity of nitrogen is low， equivalent to 1/5 of the ordinary air， the use of nitrogen can effectively reduce the noise of tyres， and improve the driving serenity.