Pure Gases CGA Selection Chart for Fittings
CGA Fittings Required – Pure Gases
510/300 Acetylene
590/346/347/702 Air
240/660/705 Ammonia
580/680/677 Argon
350 Arsine*
320 Carbon dioxide
350 Carbon monoxide
660 Chlorine
510 Cyclopropane
350 Deuterium
350 Ethane
350 Ethylene
510 Ethylene oxide
580/680/677 Helium
350/695/703 Hydrogen
330 Hydrogen chloride
330 Hydrogen sulfide
580 Krypton, kr-85
350/695/703 Methane
510 Methyl chloride
580/680/677 Neon
580/680/677 Nitrogen
326 Nitrous oxide
540/577/701 Oxygen*
350 Phosphine
510 Propane
350 Silane*
668/660 Sulfur dioxide
590 Sulfur hexafluoride
580/680/677 Xenon
Mixed Gases CGA Selection Chart for Fittings
CGA Fittings - Mixed Gases
CGA Fitting - (Mixed Gases) Minor Component in Major Component
240/660/705 Ammonia - Nitrogen
350 Butane - Nitrogen
296 Carbon Dioxide - Oxygen
580 Carbon Dioxide - Helium or nitrogen
580 Carbon Dioxide and/or Nitrogen - Helium
330 Chlorine - Nitrogen
350 Diborane - Argon, helium, Hydrogen, nitrogen
580 Freon-12 - Nitrogen
296 Helium - Oxygen
350 Hexane - Nitrogen
350 Isobutane - Nitrogen
350 Krypton-85 - Carbon monoxide, Hydrogen or methane
330 Krypton-85 - Chlorine
540 Krypton-85 - Oxygen
580 Moisture - Argon, helium or Nitrogen
660 Nitric Oxide - Nitrogen
660 Nitrogen Dioxide - Air or nitrogen
590 Nitrous Oxide - Nitrogen
590 Oxygen - Nitrogen or helium
350 Propane* - Nitrogen or helium
660 Sulfur Dioxide - Air or nitrogen
590 Sulfur Hexafluoride - Argon, helium or Nitrogen
350 Sulfur Hexafluoride - Hydrogen
350 Tritium - Argon, carbon dioxide, hydrogen, methane, neon, nitrogen, krypton, or xenon
It is recommended that the user thoroughly familiarize himself with the specific properties of these gases.
The Compressed Gas Association (CGA) has selected and standardized the valve outlet to be used on each gas cylinder. Thesestandards, contained in the document “CGA STANDARD V-1, Compressed Gas Cylinder Valve Outlet Connections" , have beenadopted to prevent the inadvertent mixing of gases which could be reactive and to avoid other possible misuse hazards.
The above chart may be used for guide purposes only. Consult your gas supplier to determine the actual CGA connection required when ordering a regulator.
*Exceptions: Flammables in Air or Oxidizers
*Propane in air, methane in air, carbon monoxide in air: CGA 590
Since the combined characteristics of a mixture of gases often differ from the properties of the separate components, different CGAconnections are often required. The chart above can be used as a reference for the CGA connections.
Mixtures which use the same CGA connection as if the minor component were in its pure gas form have not been included for the sakeof brevity. The proper fitting for these mixtures can be determined by looking up the minor component on the chart for pure gases.