I saw #KS04 and thought KO2 (potassium superoxide).
...which is used in advanced SCUBA rebreathers.
Also in spacesuits (in my novel). https://twitter.com/B_M_Finnigan/status/851896592567123968 …
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* before: 20% 02 * after: 15% 02 + 5% CO2 * KO2 processing -> 20% 02 CO2, N2, 02 are all valuable!
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