Argon

Formula
Ar
Structure
Description
Colorless odorless inert cryogenic liquid.
Uses
Gas as shield in gas metal-arc welding, in metal processing.

Registry Numbers and Inventories.
CAS
7440-37-1
EC (EINECS/ELINCS)
231-147-0
RTECS
CF2300000
RTECS class
Other
UN (DOT)
1006
Merck
12,820
Beilstein/Gmelin
821 (G)
Swiss Giftliste 1
G-9568
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
Ar
Formula mass
39.94
Melting point, °C
-189.2
Boiling point, °C
-185.86
Vapor pressure, mmHg
10322 (-150 C)
Vapor density (air=1)
1.378
Density
0.001633 g/cm3 (20 C)
Solubility in water
3.4 g/100 ml
Surface tension
12.17 (-184 C)
Dielectric constant
1.46 (-153 C)
Thermal expansion
0.0056784/K (0 C)
Heat of fusion
1.1 kJ/mol
Heat of vaporization
6.6 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
A
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Attempt to stop leak if without undue personnel hazard. Do not use water on material itself.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
None.
Decomposition
None.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Do not use water on material itself. Apply water from as far a distance as possible.
Fire potential
Non-flammable gas.
Hazards
Containers may explode when heated. Ruptured cylinders may rocket.

Health.
Poison_Class
-
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Inhalation
Acute effects - Asphyxia, dizziness, unconsiousness.
   Skin
Contact with liquid may cause frostbite.
   Eyes
Pain. Blurred vision. Severe deep burns.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. In case of contact with liquefied gas, thaw frosted parts with lukewarm water.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
1006
Response guide
Hazard class
2.2
USCG CHRIS Code
ARG
 
Std. Transport #
4904503