| 528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
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| * | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
| 10 | DF | .~ FROM SILICON REACTANT HAVING AT LEAST ONE SILICON-TO-HYDROGEN OR -CARBON BOND {12} |
| 33 |  | .~.~ Silicon reactant contains two or more silicon atoms {4} |
| 34 | DF | .~.~.~> With silicon reactant containing a single silicon atom |
| 35 | DF | .~.~.~> Silicon reactamt contains only carbon atom, only a carbon chain, or chain of carbon and oxygen atoms only between two silicon atoms |
| 36 | DF | .~.~.~> Silicon reactant contains at least one halogen atom bonded to a carbon atom which carbon atom is not an acyl halide carbon atom |
| 37 | DF | .~.~.~> Reactant contains a silicon atom as a ring member of a cyclic compound |