Krypton

Krypton Product information Quality code 4.5 4.7 Purity % volume >99.995 >99.997 Impurities ppm (where nothing else stated) H20 <3 <3 O2 <3 <1 N2 <10 <3 H2 <1 <0.5 Xe <10 CF4 <1 General information Filling pressure at 15 C, bar: 80-140 Material recommendations: No restrictions. Characteristics Colourless and odourless gas, non-reactive. Health risks Asphyxiating. Transport ADR Class 2, 1(a) Physical data Molecular weight: 83.80Boiling point at 1.013 bar,C: -153.35Density (1.013 bar, 15 C) kg/m3: 3.55Vapour pressure at 0 C, bar:20 C, bar:Flammability range in air, % (volume): Non combustibleSpecific volume (1.013 bar, 15 C), m3/kg: 0.282 Source Krypton is obtained from air separation plants. In view of its very low natural concentration in air, it is only economically viable to recover krypton from very large (typically above 1,000 tonnes of oxygen per day) plants. In these cases a stream containing a mixture of crude krypton and xenon is extracted from the plant and processed in a separate purification and distillation system. Applications. Krypton is used in various research programmes as well as for certain ion and excimer lasers. A Krypton is used in incandescent lamps, mixed with nitrogen and argon or nitrogen, argon and xenon. Krypton is also used in mixtures with argon as a filling gas for fluorescent tubes. An electric voltage applied across the mixture causes the release of ultra-violet light, which in turn causes a phosphate coating on the tube to fluoresce, and hence release E visible light. Krypton is also used as a filling gas for various halogen lamps, such as those used in cars, on airfields and in low voltage display lamps. In laboratories krypton is used for calibration standards for mass spectrometry and specific area measurements in adsorption applications. In neurology krypton is used to obtain brain X-ray pictures. Krypton is used as a triggering agent in discharge type electronic tubes. Krypton is also used as insulation gas in windows to reduce noise and heat transfer.