Krypton
Krypton
Formula: Kr
CAS No: 74390-90-9
Krypton (Kr) is a rare noble gas that is colorless, odorless, and tasteless, occurring naturally in trace amounts in the Earth’s atmosphere. Because of its low ionization energy and high atomic mass, krypton supports a wide range of industrial, scientific, and technological applications.
Applications include:
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Propellant for electric propulsion systems in satellites and spacecraft, where ionized krypton is expelled at high velocities to provide efficient, long-duration in-space propulsion.
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Window insulation for high-performance double and triple-pane designs, offering superior thermal performance (low U-factors, high R-values) compared to argon or air and enabling thinner pane spacing.
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Lighting in incandescent, halogen, fluorescent, and high-intensity discharge lamps.
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Excimer laser gas mixtures generating 222 nm (KrCl) and 248 nm (KrF) ultraviolet wavelengths.
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Sputter deposition for higher-quality coatings with heavier materials such as titanium.
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Semiconductor processing for annealing, etching, and lithography, where krypton acts as a surface disruption agent and plasma modulator to influence ion composition more selectively than argon.
At EFC Gases & Advanced Materials, we apply our rare gas expertise and global supply capabilities to provide krypton at the highest purity and reliability. With advanced analytical resources and proven industry experience, we deliver krypton solutions that enable progress in aerospace, insulation, semiconductors, lighting, and laser technologies.
Applications
Specifications
Further Specifications
Cylinder Sizes
- Power satellites and spacecraft propulsion systems.
- Insulate high-performance double and triple-pane windows.
- Illuminate lamps including incandescent, halogen, fluorescent, and HID.
- Enable excimer lasers producing 222 nm and 248 nm UV light.
- Support sputter deposition and semiconductor processing.
| Grade 4 | Grade 4.5 | Grade 5 | |
|---|---|---|---|
| Purity | 99.99% | 99.995% | 99.999% |
| Air (N2+O2+CO+CO2) | < 40 ppmv | ||
| Nitrogen | < 15 ppmv | < 4 ppmv | |
| Oxygen | < 2 ppmv | < 0.5 ppmv | |
| Carbon Monoxide | < 1 ppmv | < 0.5 ppmv | |
| Carbon Dioxide | < 1 ppmv | < 0.5 ppmv | |
| Moisture | < 10 ppmv | < 2 ppmv | < 2 ppmv |
| Total Hydrocarbons | < 1 ppmv | < 0.5 ppmv | |
| Xenon | < 20 ppmv | < 1 ppmv | |
| CF4 | < 50 ppmv | < 0.1 ppmv | |
| Sulfur Hexafluoride | < 0.1 ppmv | ||
| C2F6 | < 0.1 ppmv |
| Chemical & Physical Properties | |
|---|---|
| Molecular Weight | 83.80 |
| Specific Volume | 4.6 cu.ft/lb |
| Pressure @ 70°F | 2,400 psia |
| Valve Outlet | CGA 580 |
| Shipping Data | |
|---|---|
| DOT Name | Krypton |
| Hazard Class | 2.2 |
| DOT No. | UN 1056 |
| DOT Label | Green, non-flammable gas |
| CAS No. | 74390-90-9 |
| Cylinder Size | Fill Volume (L) |
|---|---|
| 49L/Size 300 | 10,000 |
| 44L/Size 200 | 7,000 |
| 44L/Size 200 | 5,000 |
| 16L/Size 80 | 2,000 |
| 5.9L/Size 33A | 1,000 |
| 3.9L/Size 22A | 500 |
| 1.7L/Size 9A | 250 |
| 1.7L/Size 9A | 100 |
| 0.5L/Lecture Bottle | 50 |
| 0.5L/Lecture Bottle | 25 |
Moisture level guaranteed only when EFC Gases & Advanced Materials prepares the cylinders.
All concentrations are on a mol/mol basis unless otherwise stated. Product sold on the basis of total impurities. Individual impurities may vary slightly.
