Due to the relatively small size of the methane molecule compared to other hydrocrabons, natural gas has a very low density at atmospheric conditions. Thus, in order to achieve densities sufficient for economic transport either high pressures (CNG) or very low temperatures (LNG) are required. Traditional storage vessel materials such as steels produce a very low weight to storage pressure ratio for high pressure applications. In addition, these matierlas become very brittle when subject to low temperatues which inhibilts their ability to be used for moderate to high pressure - low temperature applications (Chilled CNG or Chilled ANG). Carbon based composite materials however do not suffer from these drawbacks but rather excel in high pressure - low temperature environments.