Methane is a colorless, odorless gas that occurs abundantly in nature and as a product of certain human activities. Methane is the simplest member of the paraffin series of hydrocarbons and is among the most potent of the greenhouse gases. Its chemical formula is CH4.
In nature, methane is produced by the anaerobic bacterial decomposition of vegetable matter under water (where it is sometimes called marsh gas or swamp gas). Wetlands are the major natural source of methane produced in this way. Other important natural sources of methane include termites (as a result of digestive processes), volcanoes, vents in the ocean floor, and methane hydrate deposits that occur along continental margins and beneath Antarctic ice and Arctic permafrost.
Methane also is the chief constituent of natural gas, which contains from 50 to 90 percent methane (depending on the source), and occurs as a component of firedamp (flammable gas) along coal seams.
- Reacts with steam at high temperatures to yield Carbon Monoxide and Hydrogen
- Incomplete combustion yields carbon black, which is used as a reinforcing agent in car tires
|Grade 2||Grade 3||Grade 4||Grade 4.5||Grade 5||Grade 5.5||Grade 6|
|Nitrogen||< 3000 ppmv||< 200 ppmv||< 40 ppmv||< 20 ppmv||< 5 ppmv||< 1 ppmv||< 0.5 ppmv|
|Oxygen||< 750 ppmv||< 50 ppmv||< 5 ppmv||< 5 ppmv||< 2 ppmv||< 1 ppmv||< 0.5 ppmv|
|Ethane||< 60 ppmv||< 30 ppmv||< 5 ppmv||< 3 ppmv||< 0.5 ppmv|
|Other Hydrocarbons||< 1.0%||< 800 ppmv||< 10 ppmv||< 5 ppmv||< 2 ppmv||< 1 ppmv||< 0.5 ppmv|
|Moisture||< 10 ppmv||< 5 ppmv||< 5 ppmv||< 5 ppmv||< 2 ppmv||< 1 ppmv||< 0.5 ppmv|
|Total Impurities||< 1.0%||< 1000 ppmv||< 100 ppmv||< 50 ppmv||< 10 ppmv||< 5 ppmv||< 1 ppmv|
|Chemical & Physical Properties|
|Specific Volume||23.7 cf/lb|
|Flammability Limits||5.0 - 15% in air|
|Valve Outlets||CGA 350 LB CGA 170|
|Cylinder Size||Fill Volume (CF)|
**Moisture level guaranteed only when Electronic Fluorocarbons prepares the cylinders.
All concentrations are on a mol/mol basis unless otherwise stated.
This product is analyzed gas phase.
*This gas not available for purchase online.