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Metals, alloys and elements

Argon

Also known as Argon-40, Argon, Elemental, Argon 40

CAS 7440-37-1Formula ArMolar mass 39.95 g/molEC 231-147-0
GHS signal word: Warning. Pictograms: Gas under pressure 72 suppliers listed
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Element with atomic number and standard atomic weight

Key facts

What buyers check first

All properties
Appearance
Colorless monatomic gas
Melting point
-186.4 °C
Boiling point
-185.8 °C
Density
1.633 g/L
Solubility
Solubility of gas in water at 20 °C: 33.6 cm³/kg water
HS code
280421
Category
Metals, alloys and elements
UN number
UN 1006
Illustrative photo, a small gas cylinder with a regulator in a lab on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Argon?

Plain description, key identifiers and synonyms

Argon(0) is a monoatomic argon. It has a role as a neuroprotective agent and a member of food packaging gas.

Argon is a chemical element with symbol Ar and atomic number 18, rare gas.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
argon
CAS number
7440-37-1 CAS number cross-checkedOther or deprecated CAS: 1290046-39-7, 13965-95-2, 13994-72-4, 14163-25-8
EC number
231-147-0
Molecular formula
Ar
UNII
67XQY1V3KH
INCI name
ARGON
InChIKey
XKRFYHLGVUSROY-UHFFFAOYSA-N
InChI
InChI=1S/Ar
SMILES (canonical and isomeric)
[Ar]

Synonyms

  • Argon-40
  • Argon, Elemental
  • Argon 40
  • AR
  • Khladon r 740
  • INS NO.938
  • argon atom
  • Argon36
  • argon(0)
  • Argon, >=99.998%
  • Argon element
  • Atomic Argon
  • Element Argon
  • Element:Argon
  • Element-Ar
  • Element:Ar
  • Argon (element)
  • Argon (atomic)
  • Argon, compressed
  • Ar (element)
  • (~40~Ar)argon
  • (~36~Ar)Argon
  • (~41~Ar)Argon
  • [Ar]
  • Argon, compressed [UN1006] [Nonflammable gas]
Show all 28 synonyms
  • Argon, 99.999%, Messer(R) CANGas
  • Argon, refrigerated liquid (cryogenic liquid)
  • Argon, refrigerated liquid (cryogenic liquid) [UN1951] [Nonflammable gas]

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless monatomic gasexp.
Odour
Odorlessexp.
Taste
Tastelessexp.
Melting point
-186.4 °Cexp.
Boiling point
-185.8 °Cexp.
Density
1.633 g/Lexp.
Solubility
Solubility of gas in water at 20 °C: 33.6 cm³/kg waterexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
39.95 g/molcalc.
Exact mass
39.9624 Dacalc.
LogP (octanol/water)
0calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
1calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS04: Gas under pressure
Gas under pressure

Hazard statements

  • H280Contains gas under pressure, may explode if heated.
  • H281Contains refrigerated gas, may cause cryogenic burns or injury.
Precautionary statements (4)
  • P282Wear cold insulating gloves and either face shield or eye protection.
  • P336 + P317Thaw frosted parts with lukewarm water. Do not rub affected area. Get medical help.
  • P403Store in a well-ventilated place.
  • P410 + P403Protect from sunlight. Store in a well-ventilated place.
UN number
UN 1006
Transport hazard class
2.2

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Argon suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 72 suppliers
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Where suppliers are based

72 suppliers in 12 countries

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Argon price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Argon is used as an inert gas shield in arc welding, as an inert gas to fill electric lamps, as a blanketing agent in metals refining (especially titanium and zirconium), in ionization chambers and particle counters, and in doping semiconductors with controlled amounts of impurities.

Argon is used primarily by the semiconductor industry as an inert atmosphere for growing single silicon cystals. Argon is also used as an atmosphere during ion-implant procedures and during annealing, a process to repair substrate damage after ion implantation takes place.

Gas as shield in gas metal-arc welding, in metal processing, carrier in gas-liquid and gas-solid chromatography, gas filler for incandescent light bulbs.

Read more

Gas in fluorescent tubes analogous to neon lights, but produces a blue-purplish light, in rectified tubes, in thermometers above mercury, in lasers, wherever an inert atmosphere is desired and the much cheaper nitrogen cannot be used, in ionization chambers and particle counters, in mixtures with He and Ne in Geiger counters, in argon-oxygen-decarburizing process for stainless steel, in manufacture of semiconducting devices, in gas mixtures as the working fluid in plasma arc devices. Liquid as cryogen to produce low temperatures. The isotope As(40) is always found in minerals containing potassium, since it is a product of K(40) decay, measuring the amount of AS(40) and K(40) can be used for determining the geologic age of minerals and meteors.

Use classes: Food additives.

Cosmetic ingredient, INCI name ARGON(antioxidant)

Roles

  • additive
  • food additive
  • food component
  • food packaging gas
  • neuroprotective agent
  • pharmaceutical
  • physiological role
  • protective agent

Functional uses

  • Antioxidant
  • Dehydrating agent (desiccant)
  • Propellants, non-motive (blowing agents)

Cosmetic functions

  • Antioxidant

How it is made

Virtually all commercial production of argon is the result of oxygenic separation of atmospheric gases.

(1) By fractional distillation of liquid air. (2) By the treatment of atmosphere nitrogen with metals such as magnesium and calcium to form nitrides. (3) Recovery formed natural gas oxidation bottoms-steam in ammonia plant. (4) Originally form by radioactive decay of K40.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • Food additive

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Argon is traded under.

HS 2804.21Exact HS code

Gases, rare: argon

World exports in 2024
$331M
−2.2% vs 2023, imports $354M
2019 to 2024
Top exporters
  1. Germany13.7%
  2. Netherlands9.0%
  3. Belgium8.7%
Top importers
  1. Italy10.9%
  2. France * partner reported7.5%
  3. United States7.4%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Argon is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Argon, based on the data on this page

What is Argon?

Argon(0) is a monoatomic argon. It has a role as a neuroprotective agent and a member of food packaging gas.

What is the CAS number of Argon?

The CAS registry number of Argon is 7440-37-1. Other or deprecated CAS numbers: 1290046-39-7, 13965-95-2, 13994-72-4.

What is the molecular formula and weight of Argon?

The molecular formula of Argon is Ar and its molar mass is 39.95 g/mol.

What is Argon used for?

Argon is used as an inert gas shield in arc welding, as an inert gas to fill electric lamps, as a blanketing agent in metals refining (especially titanium and zirconium), in ionization chambers and particle counters, and in doping semiconductors with controlled amounts of impurities.

Is Argon hazardous?

Argon carries the GHS signal word "Warning". Main hazards: contains gas under pressure, may explode if heated, contains refrigerated gas, may cause cryogenic burns or injury. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Argon?

Argon is usually classified under HS code 280421 (Argon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Argon?

CompoundList lists 72 suppliers of Argon in South Korea, United States, China, India and 8 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Argon in India?

4 suppliers in India list Argon on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Argon?

Suppliers quote Argon on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Argon

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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