Commercial LPG (Liquefied Petroleum Gas) is a blend of light hydrocarbons, mainly composed of propane and butane, made through crude oil refining process or extracted from underground oilfields. The most widespread product is currently the commercial field grade propane, characterised by its high purity.
Propane’s commercial characteristics (downlaod .pdf)
At ambient standard temperature and pressure, GPL appears in the form of gas but can be liquefied if subject to light pressure, thus reducing its volume in this phase (from 250 to 273 times depending on its composition); as a result, a large amount of energy can be stored in a small space.
Comparison between propane and other energy sources (downlaod .pdf)
LPG has a variety of uses, it is especially popular for heating and as vehicle fuel. When burnt, LPG is very clean and so able to guarantee respect for environment. LPG is, in fact, an environmentally friendly source of energy.