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Chlorine, Cl2, is a greenish-yellow, highly toxic, poisonous, corrosive, oxidizing, liquified gas with a pungent, irritating odour.

Pure chlorine is used:

  • in semiconductor fabrication: plasma etching of aluminum and other metal layers
  • in the chlorination of various organic chemicals.

Materials Compatibility
Metals: Stainless Steel; Carbon Steel; Monel; Hastelloy. Plastics: Kel-F; PTFE.
Elastomers: Viton.

Technical Properties
Molecular Weight: 70.91
Specific Gravity (Air = 1): 2.5
Odour: Pungent, irritating
CAS Registry No.: 7782-50-5