Nitrogen dioxide, NO₂ is a reddish-brown coloured, highly toxic, poisonous, oxidizing gas with an irritating odour.

Applications
Pure nitrogen dioxide is used:

• as a component of calibration gas mixtures for environmental monitoring systems and industrial hygiene gas mixtures
• in semiconductor manufacturing processes.

Materials Compatibility
Metals: Stainless Steel; Carbon Steel.
Plastics: PTFE.

Technical Properties
Molecular Weight: 46.01
Specific Gravity (Air = 1): 1.59
Odour: Irritating
CAS Registry No.: 10102-44-0