|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|
|Purity:||99.9999%||Product Name:||Helium Gas|
|Application:||Minor Commercial||Critical Pressure:||0.228Mpa|
|Filling Pressure:||200Bar||Gas Content:||9.2m3|
purity plus specialty gases,
purity cylinder gas
UN1046 High Purity Helium Gas Cas 7440-59-7 , Non Flammable Compressed Gas
Helium is a chemical element with symbol He and atomic number 2.
There are nine known isotopes of helium, but only helium-3 and helium-4 are stable. In the Earth's atmosphere, one atom is 3He for every million that are 4He. Unlike most elements, helium's isotopic abundance varies greatly by origin, due to the different formation processes. The most common isotope, helium-4, is produced on Earth by alpha decay of heavier radioactive elements; the alpha particles that emerge are fully ionized helium-4 nuclei. Helium-4 is an unusually stable nucleus because its nucleons are arranged into complete shells. It was also formed in enormous quantities during Big Bang nucleosynthesis.
Helium-3 is present on Earth only in trace amounts; most of it since Earth's formation, though some falls to Earth trapped in cosmic dust. Trace amounts are also produced by the beta decay of tritium. Rocks from the Earth's crust have isotope ratios varying by as much as a factor of ten, and these ratios can be used to investigate the origin of rocks and the composition of the Earth's mantle.
3He is much more abundant in stars as a product of nuclear fusion. Thus in the interstellar medium, the proportion of 3He to 4He is about 100 times higher than on Earth. Extraplanetary material, such as lunar and asteroid regolith, have trace amounts of helium-3 from being bombarded by solar winds. The Moon's surface contains helium-3 at concentrations on the order of 10 ppb, much higher than the approximately 5 ppt found in the Earth's atmosphere. A number of people, starting with Gerald Kulcinski in 1986, have proposed to explore the moon, mine lunar regolith, and use the helium-3 for fusion.
Liquid helium-4 can be cooled to about 1 kelvin using evaporative cooling in a 1-K pot. Similar cooling of helium-3, which has a lower boiling point, can achieve about 0.2 kelvin in a helium-3 refrigerator. Equal mixtures of liquid 3He and 4He below 0.8 K separate into two immiscible phases due to their dissimilarity (they follow different quantum statistics: helium-4 atoms are bosons while helium-3 atoms are fermions). Dilution refrigerators use this immiscibility to achieve temperatures of a few millikelvins.
It is possible to produce exotic helium isotopes, which rapidly decay into other substances. The shortest-lived heavy helium isotope is helium-5 with a half-life of 7.6×10−22 s. Helium-6 decays by emitting a beta particle and has a half-life of 0.8 second. Helium-7 also emits a beta particle as well as a gamma ray. Helium-7 and helium-8 are created in certain nuclear reactions. Helium-6 and helium-8 are known to exhibit a nuclear halo.
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.|