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Acetylene (C2H2) is a colorless, highly flammable gas. Mostly used for oxy-fuel cutting applications, acetylene has a high heat release in the primary flame and a low heat in the secondary flame. It has the hottest flame temperature of the commercially available fuel gases (6,300 °F/3, 480 °C) and is an excellent choice for welding, brazing and cutting of steel alloys less than 1 inch thickness.

Argon and Liquid Argon
Colorless, odorless, tasteless and non-toxic, Argon (Ar) is a noble gas that comprises 0.93% of the earth's atmosphere. Argon can provide an inert and clean environment free from nitrogen and oxygen for annealing and rolling metals and alloys. In the casting industry, argon is used to flush porosity from molten metals to eliminate defects in castings. In the metal fabrication industry, argon is used to create an inert gas shield during welding. Argon is frequently blended with carbon dioxide (CO2), hydrogen (H2), helium (He) or oxygen (O2) to enhance the arc characteristics or facilitate metal transfer in Gas Metal Arc Welding (GMAW or MIG).

Carbon Dioxide
Carbon Dioxide is a tasteless, colorless, odorless nonflammable gas. Carbon Dioxide is a major part of the basic life cycle in nature. Humans inhale oxygen and exhale carbon dioxide, which are in turn used by plants to help them grow. Plants then release oxygen, which is depended upon by humans for survival. Carbon Dioxide is used in many applications:

Compressed Air (not available in bulk)
Compressed Air is a colorless, odorless, nonflammable gas. Industrial air is used in air carbon arc gouging and in plasma arc cutting (PAC) processes.

Helium (He) is the second lightest elemental gas next to hydrogen. Colorless, odorless, tasteless, nontoxic and chemically inert, helium is nonflammable and has a high thermal conductivity. It is used to create an inert gas shield and prevent oxidation during welding of metals such as aluminum, stainless steel, copper and magnesium alloys. The addition of helium generally increases weld pool fluidity and travel speed.

Hydrogen is colorless, odorless, tasteless and nontoxic. Hydrogen is flammable and burns in air with a pale blue, almost invisible flame. Hydrogen is the lightest of all gases. Hydrogen is commonly found in nature as compounds with other elements. It is the most abundant element found on earth. Hydrogen is used in many applications:

Nitrogen is a colorless, odorless, nonflammable inert gas. Nitrogen is used in many applications:

Nitrous Oxide
Nitrous Oxide (N2O) is a colorless, oxidizing, liquified gas with a slightly sweetish taste and odor. Nitrous Oxide is used in many applications:

Oxygen is a colorless, odorless, highly oxidizing gas. Oxygen is used in many applications:

Propane (C3H8) is a colorless, flammable, liquified gas with a natural gas odor. The flame temperature of the oxy-propane flame is lower than acetylene and Praxair’s FG-2™ flames. The primary flame releases low BTU when compared to Praxair's FG-2™ or acetylene, which increases preheat time. Propane is commonly used by scrap yards for cutting carbon steel, where the cut quality is not critical. Where cut quality is not a concern, propane may be a cost-effective fuel gas.

Propylene (C3H6) is a colorless, flammable, liquified gas with a faintly sweet odor. It has high heat release in its primary and secondary flames. The heat release in the primary flame cone is similar to acetylene. The BTU capacity of the outer flame is superior to that of acetylene. Propylene combines the qualities of an acetylene flame with the secondary heating capacity of propane. The fuel gas burns hotter than propane; however, the cutting speed should be calculated on a case-by-case-basis before choosing this as the most economical choice as your fuel gas.

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nexAir is a leader in bulk gases and gas distribution for:

  • Fuel
  • Research
  • Welding
  • Brazing
  • Specialty applications
  • Purging
  • Therapy
  • Blanketing

Bulk up and keep costs down.

Bulk gas distribution is a must for large operations. But even for smaller ones, bulk gas makes a lot of sense. It eliminates the waste and cost of unused gas left in “empty” cylinders. It eliminates the downtime associated with tank change-outs. It eliminates the chance of injury that comes from cylinder handing. And it eliminates the worry of running out in critical situations.


Find out more.

For more information, or to request a quote, call our Support Center toll-free at 888-nexAir4 (888-639-2474). Or visit the Contact Us page.