Section 06 Products of the chemical or allied Industries 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes 28 53 Phosphides, whether or not chemically defined, excluding ferrophosphorus; other inorganic compounds (including distilled or conductivity water and water of similar purity); liquid air (whether or not rare gases have been removed); compressed air; amalgams, other than amalgams of precious metals Commodity Code Description 28 53 00 Phosphides, whether or not chemically defined, excluding ferrophosphorus; other inorg 28 53 10 Cyanogen chloride (chlorcyan) 28 53 90 Other