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40d:Magma-safe
Magma-safe materials are known to include iron, steel, bauxite, and adamantine, but currently it is difficult to control magma flow with floodgates since mechanisms must be made out of rocks, most of which are not magma-safe (Bauxite being a notable exception). [1]
Mechanisms made from raw adamantine are magma-safe, and will properly operate a magma-safe floodgate in a magma channel. The mechanism on the trigger need not be magma-safe, only the one on the floodgate. In order to construct mechanisms from raw adamantine, you must first allow its use for non-economic purposes in the stock screen (z and select 'stone'). You might wish to remove other stone-using jobs while adamantine is available for use. If you do not have any bauxite or adamantine available, you can also workaround floodgate based flow control by building instead screwpumps to pump the magma over barriers.
Calculations
According to the raw data files, magma's temperature is somewhere between 1300°C and 1400°C, which translates to 2300°F–2500°F .
Materials that resist magma are:
Earth:ground that has not been dug or built will not melt obsidian fortifications will allow the passage of magma, but also of magma men
Metal:
- Nickel — 2600°F (1427°C)
- Nickel silver — 2600°F (1427°C)
- Iron — 2680°F (1471°C)
- Steel — 2710°F (1488°C)
- Platinum — 3000°F (1649°C)
- Adamantine — 15000°F (8315°C)
Stone:
- Bauxite — 3600°F (1982°C)
- Raw adamantine — 15000°F (8315°C)