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40d:Fire-safe
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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.
Strangely enough, flux materials (eg limestone blocks), which are burnt up in the purification of impurities in pig iron for production of steel, are considered fire-safe and it is perfectly fine to burn calcite as a flux making steel in a limestone furnace. Ice is a fire-safe material, for some reason.