Sub-Product

Liquefied Petroleum Gas – LPG – comes from Petroleum Refining as well as Natural Gas Processing.
LPG constituents are primarily Propane, Butane, iso-Butane, Butylene, Propylene and Mixtures of these Gases.
They are liquid under pressure and gaseous at room temperature and pressure.
LPG Gases can all be compressed into Liquid at relatively low pressures and is generally stored in steel vessels ranging from small BBQ Gas Bottles to larger Gas Cylinders and LPG Bulk Storage Tanks.In different countries, the commercial and domestic LPG composition can be Propane, Butane or Propane-Butane Blends. In Australia, LPG is just Propane.

Source: ELGAS, 30 Oct 2022, LPG Properties & LPG Composition –  What Are the Properties of LPG