CAS 7439-90-9 Kr Colorless Odorless Tasteless Gas for Fluorescent Lamps
Description:
Krypton, like the other noble gases, is used in lighting and photography. Krypton light has many spectral lines, and krypton plasma is useful in bright, high-powered gas lasers, each of which resonates and amplifies a single spectral line. Krypton fluoride also makes a useful laser.
Krypton is characterized by several sharp emission lines the strongest being green and yellow. Krypton is one of the products of uranium fission. Solid krypton is white and has a face-centered cubic crystal structure, which is a common property of all noble gases.
Newradar Special Gases Material Safety Data Sheets (MSDS) are available for Krypton gas and should be used as guidelines in regard to first aid, methods of storage, handling and general use of Krypton.
Specifications:
| Component |
Specification |
Concentration |
| KRYPTON |
99.999% |
>99.999% |
| HYDROGEN(H2) |
≤0.5 ppm |
≤0.5 ppm |
| OXYGEN+AIR (O2+Ar) |
≤1.5 ppm |
≤1.5 ppm |
| NITROGEN (N2) |
≤2.0ppm |
≤2.0 ppm |
| CARBON MONOXIDE (CO) |
≤0.3ppm |
≤0.3ppm |
| CARBON DIOXIDE(CO2) |
≤0.4ppm |
≤0.4 ppm |
| CH4 |
≤0.3 ppm |
≤0.3 ppm |
| XENON(Xe) |
≤2.0 ppm |
≤2.0 ppm |
| MOISTURE (H2O) |
≤2.0 ppm |
≤2.0 ppm |
| TETRAFLUOROMETHANE (CF4) |
≤1.0 ppm |
≤1.0 ppm |
Physical properites
| Physical properties |
| Chemical name |
kr |
| Molecular weight |
83.80 |
| Density of the gas at 70°F (21,1°C), 1 atm |
0.2172 lb/ft3, 3.479 kg/m3 |
| Specific gravity of the gas at 70°F (21 ,1°C), 1 atm |
2.899 |
| Specific volume of the gas at 70ºF (21,1°C), 1 atm |
4.604 ft3/lb, 0.287 m3/kg |
| Boiling point at 1 atm |
-244.0ºF, -153.4ºC |
| Melting point at 1 atm |
-251º F, -157ºC |
| Critical temperature at 1 atm |
-82.8ºF, -63.8ºC |
| Critical density |
56.7 lb/ft3, 908 kg/m3 |
| Critical pressure |
798.0 psia, 55.02 bar |
| Triple point |
-251.3ºF, -157.4ºC |
| Latent heat of vaporization at normal boiling point |
46.2 Btu/lb, 107.5 kJ/kg |
| Latent heat of fusion at triple point |
8.41 Btu/lb, 19.57 kJ/kg |
|
Specific heat of the gas at 70ºF (21,1°C), 1 atm Cp
Cv
|
0.060 Btu/(lb) (ºF) 0.251 kJ/(kg) (ºC)
0.035 Btu/(lb) (ºF) 0.146 kJ/(kg) (ºC)
|
Applications:
1. Krypton is used in some photographic flashes for high speed photograph.
2. Krypton gas is also combined with other gases to make luminous signs that glow with a bright
greenish-yellow light.
3. Krypton is mixed with argon in energy efficient fluorescent lamps, reducing the power consumption,
but also reducing the light output and raising the cost.
4. Krypton (along with xenon) is also used to fill incandescent lamps to reduce filament evaporation and
allow higher operating temperatures.A brighter light results with more blue color than conventional
incandescent lamps.
5. Krypton's white discharge is often used to good effect in colored gas discharge tubes, which are simply
painted or stained to create the desired color (for example, "neon" type multi-colored advertising signs
are often entirely krypton-based).
6. Krypton-83 has application in magnetic resonance imaging (MRI) for imaging airways. In particular, it
enables the radiologist to distinguish between hydrophobic and hydrophilic surfaces containing an
airway.
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