Fire-safe materials

From DwarfFortressWiki

Fire-safe materials are building materials that cannot catch on fire. These include stone, glass, and metal. Wood is not a fire-safe material. Fire-safe materials are only required when the object is going to come into contact with extreme heat, such as near magma.

Flux materials, such as limestone blocks, which are burnt up in the purification of pig iron to produce steel, are considered fire-safe. It is perfectly fine to burn calcite as a flux making steel in a limestone furnace. Ice is also fire-safe material, but constructions made of ice may melt if exposed to sufficient heat.^Verify