Special gases
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methane
description
Methane (CH4) is a colorless, odorless and flammable gas.

specification
Purity , % 99.9 99.999 99.9999
oxygen ≤ 50 ppmv ≤ 1 ppmv  ≤ 0.25 ppmv 
Nitrogen ≤ 250 ppmv ≤ 4 ppmv  ≤ 0.25 ppmv 
carbon dioxide
≤ 2 ppmv  ≤ 0.02 ppmv 
Carbon monoxide
≤ 1 ppmv  ≤ 0.02 ppmv 
Moisture ≤ 50 ppmv ≤ 1.0 ppmv ≤ 0.5 ppmv 
Ethane ≤ 600 ppmv  ≤ 3 ppmv  ≤ 0.02 ppmv 
Ethylene
≤ 1 ppmv  ≤ 0.02 ppmv 
hydrogen ≤ 50 ppmv  ≤ 1 ppmv  ≤ 0.02 ppmv 
Propane
≤ 1 ppmv  ≤ 0.02 ppmv 
Propylene
≤ 1 ppmv  ≤ 0.02 ppmv 

transport
DOT shipping name Methane, compressed
DOT classification 2.1
DOT tag flammable gas
UN NO. UN 1971
CAS NO. 74-82-0
CGA/DISS /BS341/DIN477 350/W22-14L/NO.4/NO.1
Transportation status Compressible gas

Technical Information
Cylinder condition @ 21.1°C  gas
Burning limit in the air 5–15.0 %
Auto-ignition temperature ( °C ) 580
Molecular weight ( g / mol ) 16.043
Specific gravity (air =1) 0.555
Critical temperature ( °C ) -82.57
Critical pressure ( psig ) 658.39

application
- used to prepare standard gas for calibration of natural gas, petrochemical, environmental monitoring;

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