REACH
Argon
CAS Number
7440-37-1
EC Number
231-147-0
E Number
E927b
What is Argon?
Argon (CAS 7440-37-1), also supplied under food-grade designation E938, is a chemically inert noble gas used as a protective and carrier medium.
Where is Argon used?
- Electronics: inert atmosphere for semiconductor fabrication, plasma etching and sputter deposition of thin films
- Welding: shielding gas protecting weld pools in automotive and aerospace operations
- Food and beverage: E938-grade argon blankets packaged products and displaces oxygen
- Industrial cleaning: carrier gas in plasma surface treatment before coating or bonding
- Its inertness eliminates oxidation, contamination or reactive atmospheres during processing and storage.
Good to know: Food-contact applications require E938-certified supply with documented purity and compliance.
Commercial specifications
- High-purity 99.999% options
- Standard grades: industrial and welding specifications
Other Names (Synonyms)
element 18|18Ar|Argon-40|Argon, Elemental|67XQY1V3KH|KHLADON R 740|INS NO.938|Argon, isotope of mass 40|E938
What are the physical properties of Argon?
Melting Point -189.2 °C
Boiling Point -185.9 °C
Density 1.6228 x 10⁻³ g/cm³ (gas)
Appearance With the symbol A, argon is a nonflammable gas; one of the elements in the inert gas category. It is colorless.
Color colorless
Form colorless gas
Water Solubility 33.6mL/1000g H2O (20°C) [KIR78]; Henry’s law constants, k×10?4: 3.974 (25.0°C), 5.359 (65.1°C), 5.342 (91.1°C), 3.812 (222.7°C), 2.541 (267.3°C), 1.870 (287.9°C) [POT78]
Log P 0.740 (est)
How is Argon classified and handled safely? Learn More
Warning
GHS04· Compressed Gas
Hazard Statements
H280 Contains gas under pressure; may explode if heated [Warning Gases under pressure]
Which trade and regulatory codes apply to Argon?
UN Number 1006
ADR Class 2.2