| 34160 | Xanthates | |
| 34320 | Xanthophyll | |
| 48232 | X-blocks for supporting cylindrical work pieces (marking-out instruments) | |
| 34210 | Xenon (excl. radioactive isotopes) | |
| 33690 | Xenon 133 | |
| 16190 | Xenotime | |
| 48241 | X-radiation measuring or detecting instruments | |
| 48110 | X-ray apparatus, for industrial, medical, dental or veterinary use | |
| 48110 | X-ray control panels | |
| 48110 | X-ray diffraction equipment | |
| 48110 | X-ray generators | |
| 48110 | X-ray machines for inspection of banknotes and documents | |
| 93122 | X-ray photographs, interpretation of | |
| 48110 | X-ray screens | |
| 48110 | X-ray spectrometry equipment | |
| 93122 | X-ray treatment in outpatient clinics | |
| 34540 | o-Xylene (excl. in the chemically or commercially pure state) | |
| 34540 | p-Xylene (excl. in the chemically or commercially pure state) | |
| 34540 | m-Xylene (excl. in the chemically or commercially pure state) | |
| 34540 | Xylene (excl. in the chemically or commercially pure state) | |
| 34110 | Xylene isomers, mixed, chemically or commercially pure | |
| 34110 | Xylene, chemically or commercially pure | |
| 34110 | p-Xylene, chemically or commercially pure | |
| 34110 | m-Xylene, chemically or commercially pure | |
| 34110 | o-Xylene, chemically or commercially pure | |
| 34110 | Xylenesulphonic acids | |
| 34130 | Xylenols (incl. mixed isomers), chemically or commercially pure | |
| 34540 | Xylenols, crude or refined, not chemically or commercially pure | |
| 34150 | Xylidines and their salts | |
| 34540 | Xylole, crude or refined (excl. xylene in the pure or commercially pure state) | |
| 38350 | Xylophones (excl. toys) | |
| 38560 | Xylophones, toy | |
| 35240 | Xylose, chemically pure | |