20.13 - Manufacture of other inorganic basic chemicals

20.13.21 - Metalloids 20.13.22 - Halogen or sulphur compounds of non-metals 20.13.23 - Alkali or alkaline-earth metals; rare earth metals, scandium and yttrium; mercury 20.13.24 - Hydrogen chloride; oleum; diphosphorus pentaoxide; other inorganic acids; silicon and sulphur dioxide 20.13.25 - Oxides, hydroxides and peroxides; hydrazine and hydroxylamine and their inorganic salts 20.13.31 - Metallic halogenates 20.13.32 - Hypochlorites, chlorates and perchlorates 20.13.41 - Sulphides, sulphites and sulphates 20.13.42 - Phosphinates, phosphonates, phosphates, polyphosphates and nitrates (except of potassium) 20.13.43 - Carbonates 20.13.51 - Salts of oxometallic or peroxometallic acids; colloidal precious metals 20.13.52 - Inorganic compounds n.e.c., including distilled water; amalgams other than amalgams of precious metals 20.13.61 - Isotopes n.e.c. and compounds thereof (including heavy water) 20.13.62 - Cyanides, cyanide oxides and complex cyanides; fulminates, cyanates and thiocyanates; silicates; borates; perborates; other salts of inorganic acids or peroxoacids 20.13.63 - Hydrogen peroxide 20.13.64 - Phosphides, carbides, hydrides, nitrides, azides, silicides and borides 20.13.65 - Compounds of rare earth metals, of yttrium or of scandium 20.13.66 - Sulphur, except sublimed sulphur, precipitated sulphur and colloidal sulphur 20.13.67 - Roasted iron pyrites 20.13.68 - Piezo-electric quartz; other synthetic or reconstructed precious or semi-precious stones, unworked