Nitrogen N2 Industrial Gases CAS No.: 7727-37-9 EINECS No.: 231-783-9 UN No.: UN1066 Purity: 99.999%-99.9999% Dot Class: 2.2 Appearance: Colorless Grade Standard: Food Grade, Industrial Grade, Electronic Grade. In various analytical instrument applications: Carrier gas for gas chromatography, support gas for Electron Capture Detectors, Liquid Chromatography Mass Spectrometry, purge gas for Inductive Couple Plasma. Material: To fill light bulbs. In antibacterial atmosphere and instrument mixtures for biological applications . As a component in Controlled Atmosphere Packaging and Modified Atmosphere Packaging applications, calibration gas mixtures for environmental monitoring systems, laser gas mixtures. To inert many chemical reactions dry various products or materials. Liquid nitrogen: Like dry ice, the main use of liquid nitrogen is as a refrigerant.