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helium gas
1.purity:99.9-99.9999%
2.packing:cylinder or as your requments
Helium (He) |
Vapor Phase Impurities
He | >= | 99.995% | %V | N2+Kr | =< | 10 | ppmv | O2+Ar | =< | 3 | ppmv | H2 | =< | 3 | ppmv | Ne | =< | 15 | ppmv | CO | =< | 1 | ppmv | CO2 | =< | 1 | ppmv | H2O | =< | 10 | ppmv | THC(CH4) | =< | 1 | ppmv |
He | >= | 99.999% | %V | N2+Kr | =< | 2 | ppmv | O2+Ar | =< | 1 | ppmv | H2 | =< | 1 | ppmv | Ne | =< | 4 | ppmv | CO | =< | 0.5 | ppmv | CO2 | =< | 0.5 | ppmv | H2O | =< | 3 | ppmv | THC(CH4) | =< | 0.5 | ppmv |
Standard Package Information Cylinder Type | DOT3AA2400 | | Fill Weight (ft3/m3) | 282/8.0 | | Valve Connection (CGA) | 580 | | Cylinder Dimension (cm) | ø23x140 | |
Chemistry
IUPAC Name: Helium
Canonical SMILES: [He]
InChI: InChI=1S/He
Molecular Formula: He
Molecular Weight: 4 g/mol
EINECS: 231-168-5
Classification Code: Gases, diluent for
Melting Point: -272.2 °C(lit.)
Density: 0.1785(0 °C)
Vapor density: 0.14 (vs air)
Stability: Stable; extremely unreactive.
Enthalpy of Vaporization: 4.19 kJ/mol
Boiling Point: -268.934 °C(lit.)
Critical point: 5.19 K, 0.227 MPa
Vapour Pressure of Helium (CAS NO.7440-59-7): 1960000 mmHg at 25 °C
Uses Helium (CAS NO.7440-59-7) is used in cryogenics, in deep-sea breathing systems, to cool superconducting magnets, in helium dating, for inflating balloons, for providing lift in airships and as a protective gas for many industrial uses (such as arc welding and growing silicon wafers). |
