Heading 2853 · Section VI
Phosphides, chemically defined or not, not ferrophosphorus; other inorganic compounds n.e.c. (including distilled, conductivity water and water of like purity); liquid air, rare gases removed or not; compressed air; amalgams, not precious metal amalgams
Source: Harmonized System 2022 edition (World Customs Organization), from the UN Comtrade classification list.