Helium By Special Gas & Equipment Solutions Pvt. Ltd.

Helium Product information Quality Code 1.8 Plus 5.0 5.6 6.0 Purity % volume >98 >99.996 >99.999 >99.9996 >99.9999 Impurities ppm (where nothing else stated) O2 <5 <2 <0.5 <0.1 N2 <20 <5 <1 <0.1 H2O <5 <3 <2 <1 Ne <10 <8 <0.5 <0.5 CnHm <1 <1 <0.1 <0.1 H2 <0.1 <0.1 General information Filling pressure at 15 C, bar: 200 Material recommendations: No restrictions. Characteristics Colourless and odourless gas, Non-reactive. Health risks Asphyxiating. Transport ADR Class .2, 1(a) Physical data Molecular weight: 4.00Boiling point at 1.013 bar,C: -268.9Density (1.013 bar, 15 C) kg/m3: 0.169Vapour pressure at 0 C, bar:20 C, bar:Flammability range in air, % (volume): Non combustibleSpecific volume (1.013 bar, 15 C), m3/kg: 5.909 Source The primary source of helium is from natural gas wells. It is obtained by a liquefaction and stripping operation. Applications. Helium is inert and the least soluble of all gases in liquids and is therefore used as a pressurization gas for: Cryogenic rocket propellants in space/missile applicationsHeavy water in nuclear reactorsFor all liquids at room or low temperatures. Being inert, helium is used as a constituent in neutral atmospheres e.g., in heat treatment applications requiring a protective atmosphere. Helium is used extensively in the welding industry as an inert shielding gas for arc welding. It is also used in conjunction with helium (leak) detectors to test the integrity of fabricated components and systems. Helium is used as a combined cooling and shielding medium for the pulling of optical fibers. It is also used for cooling of uranium rods in nuclear reactors. Helium is used in various types of gas lasers as a buffer or carrier gas. It is also used as a carrier gas, a purge gas, and a zero (span) gas for analytical instruments. Gas mixtures of helium and hydrocarbons are also used as fill gases for nuclear counters. Helium is used in mixtures with neon and argon for filling electronic tubes such as the familiar neon sign. Various mixtures of helium and oxygen are used as breathing gases for divers who must work at great depths and therefore high pressures. The use of helium to dilute the oxygen instead of nitrogen, as in air, prevents nitrogen being dissolved in the blood, which is the cause of nitrogen narcosis (also known as bends). Helium is used to fill large balloons for upper atmosphere and cosmic ray studies. Small helium balloons are used by weather forecasters to carry meteorological instruments. Due to nonflammability and low density it is ideal for filling toy balloons (in mixtures with nitrogen), airplane tires, advertising blimps, geostationary balloons (certain projects are under way for the realization of balloons designed to serve as television transmission and observation relays). Helium mixtures with hydrocarbons are used in flushing Geiger counters used for the detection of 0:, B, Y and X-rays. Helium is used as a propellant in the helium cannon used in model firing tunnels. It also finds use as a working gas in some hypersonic wind tunnels. Helium is used as a carrier gas or as a purge gas for a variety of semiconductor processes. Helium is used as a calibration gas and a balance gas in calibration mixtures. It is also used as carrier gas in gas chromatography. Helium is used for epitaxial crystal growth (inert atmosphere). Helium is also used for vacuum breaking in heat treatment furnaces. Helium is also used to create inert furnace atmospheres in special glass processing, and processing of valuable metals. Liquid helium is used to cold the supra conductive magnets in NMR (nuclear magnetic resonans) for analytical or medical purposes.