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7440-37-1

Basic Information
CAS No.: 7440-37-1
Name: Argon
Molecular Structure:
Molecular Structure of 7440-37-1 (Argon)
Formula: Ar
Molecular Weight: 39.95
Synonyms: 40Ar;Argon, isotope of mass 40; Argon-40; Khladon R 740; R 740
EINECS: 231-147-0
Density: 1.784(0ºC)
Melting Point: -189 ºC
Boiling Point: -186 ºC
Flash Point:
Solubility: slight

Stability

    Stable. Inert.

Toxicology

    Not hazardous according to Directive 67/548/EEC. The gas presents a risk of asphyxiation if a largequantity is released into a room of small volume.

Appearance: colourless odourless gas
Hazard Symbols:
Risk Codes:
Safety: 2 from the lungs. The effect of simple asphyxiant gases is proportional to the extent to which they diminish the amount (partial pressure) of O2 in the air that is breathed. The oxygen may be diminished to 75% of its normal percentage in air before appreciable symptoms develop, and this in turn requires the presence of a simple asphyxiant in a concentration of 33% in the mixture of air and gas. When the simple asphyxiant reaches a concentration of 50%, marked symptoms can be produced. A concentration of 75% is fatal in a matter of minutes. The first symptoms produced by simple asphyxiant gases such as argon are rapid respirations and air hunger. Mental alertness is diminished and muscular coordination is impaired. Later, judgment becomes faulty and all sensations are depressed. Emotional instability often results and fatigue occurs rapidly. As the asphyxia progresses, there may be nausea and vomiting, prostration, and loss of consciousness, and finally, convulsions, deep coma, and death."> A simple asphyxiant gas. As an inert gas, it has no specific inherent dangerous properties. Gases of this type have no specific toxicity effect, but they act by excluding O2 from the lungs. The effect of simple asphyxiant gases is proportional to the extent to which they diminish the amount (partial pressure) of O2 in the air that is breathed. The oxygen may be diminished to 75% of its normal percentage in air before appreciable symptoms develop, and this in turn requires the presence of a simple asphyxiant in a concentration of 33% in the mixture of air and gas. When the simple asphyxiant reaches a concentration of 50%, marked symptoms can be produced. A concentration of 75% is fatal in a matter of minutes. The first symptoms produced by simple asphyxiant gases such as argon are rapid respirations and air hunger. Mental alertness is diminished and muscular coordination is impaired. Later, judgment becomes faulty and all sensations are depressed. Emotional instability often results and fatigue occurs rapidly. As the asphyxia progresses, there may be nausea and vomiting, prostration, and loss of consciousness, and finally, convulsions, deep coma, and death.
Transport Information:: UN 1006/1951
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