Argon (AR, LAR)

Although comprising less than one percent of the atmosphere, argon is an important industrial gas. One of its unique properties is its absolute inertness. Argon is colorless, odorless, tasteless, and non-toxic. It is slightly soluble in water. It forms no chemical compounds with any other material at any temperature or pressure. It’s an excellent conductor of electricity with a high ionization potential and low eV requirements. It is superior to nitrogen for certain inerting applications where nitride formation is a problem.

Argon plays an increasing role as welding technologies expand. It is the shielding-gas-of-choice for many electric arc welding applications, either pur, or more commonly, in mixtures with helium, carbon dioxide and oxygen. In GMAW (MIG) welding, the argon is mixed to suit the characteristics needed to weld the particular metal, whether it be mild steel, stainless steel, aluminum or copper. Argon also is the most popular shielding gas for GTAW (TIG) welding.

Liquid argon is classified as Type II by the Compressed Gas Association (CGA). CGA G11.1.Type II, Grade C is considered “commercial” liquid argon standards.


Argon is an inert gas that cannot be sensed by odor, color or taste. It is difficult to know when argon is present and may be depleting oxygen for breathing. It must be used in well ventilated areas. Efforts must always be made to avoid leaks or venting of these gases in confined space. Do not work with any inert gases in confined spaces such as tanks, pits or tunnels unless an adequate breathing air supply is available. Always provide good ventilation in enclosed areas where gases may be present.

Liquid or cold gas argon can cause frostbite-type burns. Protect eyes and skin from exposure to these low temperature materials. Wear protective goggles, gloves and clothing where cold liquid might be spilled.

Use correct pressure reducing equipment when using gas from high pressure cylinders.

Argon Weight Gas Liquid




Cubic Feet


Cubic Meters






  1 Pound 1.0 0.4536 9.671 0.2543 0.08600 0.3255
  1 Kilogram 2.205 1.0 21.32 0.5605 0.18957 0.7176
  1 SCF Gas 0.1034 0.04690 1.0 0.02628 0.008893 0.03366
  1 Nm3 Gas 3.933 1.7840 38.04 1.0 0.3382 1.2802
  1 Gal Liquid 11.630 5.276 112.5 2.957 1.0 3.785
  1 L Liquid 3.072 1.3936 29.71 0.7812 0.2642 1.0