Propane cutting torch

 

— gas fuel based on propane. The share of the latter should be at least 75% (depending on the specific brand of fuel). Propane (C3H8) is one of the lighter saturated hydrocarbons; it lends itself well to liquefaction and transportation in cylinders, however, it gives a lower flame temperature than the propane-butane mixture (see the relevant paragraph) — 2100 – 2500 °C versus 2400 – 2700 °C.