28.43 - COLLOIDAL PRECIOUS METALS; INORGANIC OR ORGANIC COMPOUNDS OF PRECIOUS METALS, WHETHER OR NOT CHEMICALLY DEFINED; AMALGAMS OF PRECIOUS METALS.

28.44 - RADIOACTIVE CHEMICAL ELEMENTS AND RADIOACTIVE ISOTOPES (INCLUDING THE FISSILE OR FERTILE CHEMICAL ELEMENTS AND ISOTOPES) AND THEIR COMPOUNDS; MIXTURES AND RESIDUES CONTAINING THESE PRODUCTS.

28.45 - ISOTOPES OTHER THAN THOSE OF HEADING No. 28.44; COMPOUNDS, INORGANIC OR ORGANIC, OF SUCH ISOTOPES, WHETHER OR NOT CHEMICALLY DEFINED.

28.46 - COMPOUNDS, INORGANIC OR ORGANIC, OF RARE-EARTH METALS, OF YTTRIUM OR OF SCANDIUM OR OF MIXTURES OF THESE METALS.

28.47 - HYDROGEN PEROXIDE, WHETHER OR NOT SOLIDIFIED WITH UREA.

28.48 - PHOSPHIDES, WHETHER OR NOT CHEMICALLY DEFINED, EXCLUDING FERROPHOSPHORUS.

28.49 - CARBIDES, WHETHER OR NOT CHEMICALLY DEFINED.

28.50 - HYDRIDES, NITRIDES, AZIDES, SILICIDES AND BORIDES, WHETHER OR NOT CHEMICALLY DEFINED, OTHER THAN COMPOUNDS WHICH ARE ALSO CARBIDES OF HEADING No. 28.49.

28.51 - 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.