295345
Helium
≥99.995%
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About This Item
Empirical Formula (Hill Notation):
He
CAS Number:
Molecular Weight:
4.00
UNSPSC Code:
12142100
PubChem Substance ID:
EC Number:
231-168-5
MDL number:
Assay:
≥99.995%
InChI key
SWQJXJOGLNCZEY-UHFFFAOYSA-N
InChI
1S/He
SMILES string
[He]
vapor density
0.14 (vs air)
assay
≥99.995%
impurities
≤5 ppm oxygen, ≤5 ppm water
bp
-268.934 °C (lit.), −268.9 °C (lit.)
mp
-272.2 °C (lit.)
Quality Level
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Packaging
Supplied in a carbon steel lecture bottle with a CGA180M/CGA110F needle valve installed.
Compatible with the following:
Compatible with the following:
- Aldrich® lecture-bottle station systems
- Aldrich® lecture-bottle gas regulators
Other Notes
See Technical Information Bulletin AL-151 Gas Regulators: Selection, Installation, and Operation
Legal Information
Aldrich is a registered trademark of Sigma-Aldrich Co. LLC
signalword
Warning
hcodes
pcodes
Hazard Classifications
Press. Gas Compr. Gas
Storage Class
2A - Gases
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves, multi-purpose combination respirator cartridge (US)
Regulatory Information
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Frédéric Aitken et al.
Physical chemistry chemical physics : PCCP, 17(28), 18535-18540 (2015-06-26)
Positively charged helium clusters, also called 'snowballs', have been investigated within normal liquid helium. Thermodynamic state equations for ionic helium clusters in liquid helium have been developed, allowing us to discern the 'hydrodynamic' radius for a wide range of hydrostatic
Gezina T M L Oei et al.
Anesthesiology, 112(6), 1503-1510 (2010-05-13)
Experimental research in cardiac and neuronal tissue has shown that besides volatile anesthetics and xenon, the nonanesthetic noble gas helium also reduces ischemia-reperfusion damage. Even though the distinct mechanisms of helium-induced organ protection are not completely unraveled, several signaling pathways
Andrea S Terpstra et al.
Chemical communications (Cambridge, England), 49(16), 1645-1647 (2013-01-24)
Helium ion microscopy (HIM) has been used to image mesoporous silica and organosilica for the first time. Images of chiral nematic silica, ethylenesilica, and new benzenesilica reveal the structural organization, pore dimensions and connectivity of these materials on the nanometer
Zoltán Pálinkás et al.
British journal of pharmacology, 172(6), 1516-1532 (2014-05-16)
The actions of hydrogen sulfide in human physiology have been extensively studied and, although it is an essential mediator of many biological functions, the underlying molecular mechanisms of its actions are ill-defined. To elucidate the roles of sulfide in inflammation
Andri K Riau et al.
Journal of biomedical nanotechnology, 10(8), 1552-1562 (2014-07-16)
Over the last decade, femtosecond lasers have emerged as an important tool to perform accurate and fine dissections with minimal collateral damage in biological tissue. The most common surgical procedure in medicine utilizing femtosecond laser is LASIK. During the femtosecond
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