Esbit is a solid fuel in tablet form, which is used by campers and hobbyists. It is also used by the military. Esbit burns smokelessly, has a high energy density, does not liquify while burning and does not leave behind any ashes. Its main components are Trioxane and Hexamine. While many companies produce similar products, the name was originally given by a German manufacturer (see link).

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External links:

Esbit company (http://www.esbit.de/esbit.start.en.php)

Tablet shapes (http://www.esbit.de/esbit.tabs.en.php)