Special gases
current location:Home > Product > Special gases
Krypton gas
description
Helium (Kr) is a colorless, non-flammable, odorless, inactive gas.

specification
Purity , % 99.999 99.99999
oxygen ≤ 1.0 ppmv ≤ 0.01 ppmv
Nitrogen ≤ 4.0 ppmv ≤ 0.03 ppmv
carbon dioxide ≤ 0.3 ppmv ≤ 0.005 ppmv
Carbon monoxide ≤ 0.2 ppmv ≤ 0.005 ppmv
Methane ≤ 0.3 ppmv ≤ 0.005 ppmv
Moisture ≤1.0 ppmv ≤ 0.02 ppmv
Helium ≤ 0.7 ppmv ≤ 0.005 ppmv
Helium ≤ 0.1 ppmv ≤ 0.001 ppmv
hydrogen ≤1.0 ppmv ≤ 0.005 ppmv

transport
DOT shipping name Helium, compressed
DOT classification 2.2
DOT tag Non-flammable gas
UN NO. UN 1056
CAS NO. 7439-90-0
CGA/JIS/BS341/DIN477 580/W26-14R/NO.3/NO.6
Transportation status Compressible gas

Technical Information
Cylinder condition @ 21.1°C  gas
Burning limit in the air Nonflammable
Auto-ignition temperature ( °C ) -
Molecular weight ( g / mol ) 83.8
Specific gravity (air =1) 2.894
Critical temperature ( °C ) -63.75
Critical pressure ( psig ) 783.3

application
- 氪 is mainly used in the gaseous form for the production of fluorescent lamps and halogen lamps in an electric light source. The high molecular weight of bismuth makes the lamp have a longer working life. 氪 is also used for insulation of windows to reduce heat loss. Other applications for hydrazine include laser gas, scientific research, and fluid sterilization lamps;

Share to: