| 252 / | HD | COMPOSITIONS |
| 500 | DF | ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS {6} |
| 518.1 | DF | .~ Metal compound containing {16} |
| 519.5 | | .~.~ Zinc compound {4} |
| 519.51 | DF | .~.~.~> Additional diverse metal containing |
| 519.52 | DF | .~.~.~> With boron compound |
| 519.53 | DF | .~.~.~> With halogen compound |
| 519.54 | DF | .~.~.~> Silicon containing or with compound of bismuth or silicon |