1. The main components of LPG are propane, butane and other alkanes. 2. The main component of natural gas is methane, with a small amount of ethane and propane. 1. Methane is a flammable and explosive gas, and it is easy to catch fire or explode when the content reaches 4.4-17%. 2. When ethane is also mixed with air, it forms an explosive mixture. Natural gas and liquefied petroleum gas contain a variety of combustible gases, which seriously threaten the production safety of industrial sites.