|Place of Origin:||China|
|Minimum Order Quantity:||50pcs|
|Packaging Details:||Packed in10L-50L cylinder or packed according to the demands.|
|Delivery Time:||30-35 working days after received your payment|
|Payment Terms:||L/C, , T/T, Western Union, MoneyGram|
|Supply Ability:||1000 pcs per month|
|Product Name:||Helium Gas||Purity:||99.9999%|
|CAS No.:||7440-59-7||EINECS No.:||275-187-7|
|Cylinder Volume:||10L-50L||Valve:||CGA 580|
|Filling Pressure:||200Bar||Gas Content:||9.2m3|
purity plus specialty gases,
purity cylinder gas
Scientific High Purity Helium He Gas Packed In DOT Cylinders 10L - 50L
Although it is rare on Earth, helium is the second most abundant element in the known Universe , constituting 23% of its baryonic mass. The vast majority of helium was formed by Big Bang nucleosynthesis one to three minutes after the Big Bang. As such, measurements of its abundance contribute to cosmological models.
Neutral helium at standard conditions is non-toxic, plays no biological role and is found in trace amounts in human blood.
Unlike any other element, helium will remain liquid down to absolute zero at normal pressures. This is a direct effect of quantum mechanics: specifically, the zero point energy of the system is too high to allow freezing. Solid helium requires a temperature of 1–1.5 K and about 25 bar of pressure. It is often hard to distinguish solid from liquid helium since the refractive index of the two phases are nearly the same. The solid has a sharp melting point and has a crystalline structure, but it is highly compressible; applying pressure in a laboratory can decrease its volume by more than 30%.
Since helium has a lower boiling point than any other element, low temperature and high pressure are used to liquefy nearly all the other gases . The resulting crude helium gas is purified by successive exposures to lowering temperatures, in which almost all of the remaining nitrogen and other gases are precipitated out of the gaseous mixture.
While balloons are perhaps the best known use of helium, they are a minor part of all helium use. Helium is used for many purposes that require some of its unique properties, such as its low boiling point, low density, low solubility, high thermal conductivity, or inertness. The largest use is in cryogenic applications, most of which involves cooling the superconducting magnets in medical MRI scanners and NMR spectrometers. Other major uses were pressurizing and purging systems, welding, maintenance of controlled atmospheres, and leak detection. Other uses by category were relatively minor fractions.
1. Physical properties
|Commodity||High purity helium gas|
|Hazardous class for transort||2.2|
2. Typical technical data (COA)
Helium % ≥
|Ne ppm ≤||4||2||1|
|H2 ppm ≤||1||
|O2 ppm ≤||1||1||0.5|
|N2 ppm ≤||2||1||1|
|CO ppm ≤||0.5||0.2||0.1|
|CO2 ppm ≤||0.5||0.2||0.2|
|CH4 ppm ≤||0.5||0.2||0.1|
|H2O ppm ≤||3||2||1|
|8ltr||1||100bar||According to the valve type|
|40ltr||5.5||135bar||According to the valve type|
|Other sizes are also available|
|Controlled Atmospheres||protective gas in growing silicon and germanium crystals, in titanium andzirconium production, and in gas chromatography|
|Gas tungsten arc welding||
One industrial application for helium is leak detection. Because helium diffuses through solids three times faster than air, it is used as a tracer gas to detect leaks in high-vacuum equipment and
Airships and balloons are inflated with helium for lift.
Another minor use is in rocketry, where helium is used as an ullage medium to displace fuel and oxidizers in storage tanks and to condense hydrogen and oxygen to make rocket fuel
|Minor commercial and recreational uses||Helium as a breathing gas has no narcotic properties, so helium mixtures such as trimix, heliox and heliair are used for deep diving to reduce the effects of narcosis|
The use of helium reduces the distorting effects of Temperature variations in the space between lenses in some telescopes,due to its extremely low index of refraction.