A firelog is a manufactured log constructed to be used as fuel wood . Firelogs are designed to be inexpensive, while being easier to ignite, and burn longer, and more efficiently than firewood . Firelogs are traditionally manufactured using two methods. The first uses only compressed sawdust and the second uses sawdust and paraffin , which is mixed and extruded into a log shape. The extruded firelogs are individually wrapped in paper and can be ignited.
A new cleaner has been developed using waste fiber from the oil palm fruit bunches of South East Asia. [ Citation needed ] Unlike sawdust logs thesis burn with zero sulfur emission. Also unlike sawdust logs, no trees need to be felled to produce these firelogs [ citation needed ] . While it is beneficial that the oil palm derived logs are used, the overall impact of palm oil plantations is problematic because of large areas of tropical rain forest in Borneo and Sumatraare being clear cutto open up the land for palm plantations. This activity directly threatens habitats of endangered species such as the orangutan . 
Other new types of firelogs include one made of waste wax-cardboard such as that used in the packing of perishable foods for shipment, which is used to create a compressed cardboard firelog, and another made from renewable Greek cotton seedlings, offering a high energy content .
The materials used for a traditional firelog are variable, the sawdust used to be of commercial wood waste from manufacturers, or waste agricultural biomass (nut shells, fruit pits, etc.); additionally bio-wax may be used in place of paraffin (petroleum-based wax).
There are now a number of wood and wax firelogs made using renewable materials. These are made using a plant based on oil palm oil. These logs can be considered to be carbon neutral firelogs during combustion as the carbon released on combustion is the same carbon absorbed when the plants are growing. Sulfur emissions are virtually eliminated with renewable firelogs as they do not contain paraffin waxes.
|Extruded firelog||1500 BTU / lb||3.4 MJ / kg|
|Firewood||6190 BTU / lb||14.4 MJ / kg|
|Wood pellets||8400 BTU / lb||19.54 MJ / kg|
|Compressed firelog||8500 BTU / lb||19.8 MJ / kg|
|Palm fiber firelog||10500 BTU / lb||24.4 MJ / kg|
|Java-Log||12620 BTU / lb||29.3 MJ / kg|
|Northland||13540 BTU / lb||31.4 MJ / kg|
|Duraflame Xtra Time||13770 BTU / lb||32.0 MJ / kg|
|Duraflame Easy Time||14420 BTU / lb||33.5 MJ / kg|
|Pine Mountain Superlog||15190 BTU / lb||35.2 MJ / kg|
|Cotton plant firelog||17000 BTU / lb||39.8 MJ / kg|
|Fossil fuel oil or Diesel||18600 BTU / lb||43.26 MJ / kg|
- Wood fuel
- Wood briquette
- Wood pellet
- Jump up^ “THE EFFECTS OF PALM OIL HOW DOES PALM OIL HARM ORANGUTANS AND OTHER WILDLIFE?” . Orangutan Foundation International . Retrieved 3 January 2015 .