On 04/17/2008 composite agency posts: At 33 degrees Celsius, the carbon dioxide permeability, in absence of other diffusing chemicals, such as water vapour, hydrogen sulfide, methane, ethane, propane and heavier hydrocarbons such as hexane, propane, napthalenes, equals 5.5 E-12 [m3 stp / m3 bar]x[m2/s] in isotactic polypropylene with a crystalline fraction of 45 weight percent. The activation energy for permeation is 44 kilo Joule. This activation energy in relation to the permeability is applicable in the range of 270 to 325 Kelvin, and 0.1 to 10 bar pipeline system pressure.

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