| 252 / | HD | COMPOSITIONS |
|
| 500 | DF | ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS {6} |
| 518.1 |  | .~ Metal compound containing {16} |
| 519.1 | DF | .~.~> Compound viewed as composition (i.e., wherein atoms or molecules in a chemical formula are not present as whole small integer values or cannot be multiplied by a single-digit factor to yield integer values) {4} |
| 519.2 | DF | .~.~> Organometallic (e.g., soap, complex, etc.) {1} |
| 519.3 | DF | .~.~> With organic compound {3} |
| 519.4 | DF | .~.~> Sulfur, selenium, or tellurium containing |
| 519.5 | DF | .~.~> Zinc compound {4} |
| 520.1 | DF | .~.~> Tin compound |
| 520.2 | DF | .~.~> Titanium or zirconium compound {2} |
| 520.3 | DF | .~.~> Silver, gold, or platinum compound |
| 520.4 | DF | .~.~> Vanadium compound |
| 520.5 | DF | .~.~> Tungsten or yttrium compound |
| 521.1 | DF | .~.~> Rare earth metal compound |
| 521.2 | DF | .~.~> Iron, cobalt, or nickel compound |
| 521.3 | DF | .~.~> Silicon containing or with silicon compound |
| 521.4 | DF | .~.~> Boron containing or with boron compound |
| 521.5 | DF | .~.~> Halogen, carbon, phosphorus, or nitrogen containing |
| 521.6 | DF | .~.~> With nonmetal compound containing halogen, nitrogen, phosphorus, or sulfur |