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This article is about an older version of DF.

Fire-safe materials are those that are not damaged by fire. These materials include glass, (most) metal (tin has a low enough melting point to turn into a pool of tin if exposed to fire), ash, and most stone. Only nether-cap wood is fire-safe; all other types of wood are not. Bituminous coal, lignite, charcoal, and coke are all flammable and ought not be fire-safe, but the bug mentioned below allows them to be used as fire-safe building materials. Furthermore, the game only considers bars, blocks, stone, logs, and anvils to be capable of being fire-safe - all other item types are rejected outright.

Fire-safe materials are only required when the object is going to come into contact with extreme heat, such as all conventional furnaces and the forge. For the magma-powered versions of these buildings, as well as anything that will be in direct contact with magma (such as floodgates), fire-safe material is not enough: it has to be magma-safe.

As far as the game is concerned, only materials which are stable at the temperature 11000 °U (i.e. MELTING_POINT/BOILING_POINT/IGNITE_POINT/HEATDAM_POINT greater than 11000 and COLDDAM_POINT less than 11000) are considered fire-safe. Despite this temperature being considered fire-safe, actual fire can generate temperatures significantly higher (in particular, any burning item will heat up to 200 degrees above its material's ignite point).Bug:5011