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Volatiles is a combustible gas, likely chloromethane or other chloride based organic compound, that can be used in combination with Oxygen as a Fuel. The main source of Volatiles on most planets is in the form of Ice (Volatiles) that can be mined on the surface. It is the breathing gas of the Zrillian species. Although the game commonly labels Volatiles as H2, a hydrogen pair molecule, the saved files list X gas as chlorine, meaning to produce carbon dioxide and chlorine, and water, as a byproducts, the compound must contain all three elements.


Different ratios of Volatiles and Oxygen will produce different temperatures and pressures during combustion. Combustion will create a large amount of Heat, pressure, and Carbon Dioxide. This reaction is useful inside a Furnace for smelting ores and creating alloys, but can be catastrophic when inside a Canister or a room. Currently as of version v0.1.1089.5513, it is labeled in the atmospheric analyzer as H2, but it is not Hydrogen.[1]. When burned, it produces heat, Pollutants, and Carbon Dioxide in the following reaction:

2 [Volatiles] + 1 O2 → 3 X + 6 CO2 + Heat

This reaction is inconsistent with volatiles being simple hydrocarbons (too much CO2 is produced), but it may be consistent with more complex organic molecules. The reaction appears to only take place with specific quantities of gas, so Oxygen is often left over even when there is an excess of volatiles.

Volatiles have a specific heat of 20.4 Joule / mol.


You can collect Hydrogen from the following sources:

Source Amount
Ice (Volatiles) 22 mol

Can be also obtainable by trading.


  • Seems that a concentration of H2 greater than 6% in an atmosphere it is lethal to plants, keep attention on that designing a greenhouse, because Advanced Composter will release H2 during the process.