| 252 / | HD | COMPOSITIONS |
| 71 | DF | HEAT-EXCHANGE, LOW-FREEZING OR POUR POINT, OR HIGH BOILING COMPOSITIONS {2} |
| 73 | DF | .~ Organic components {3} |
| 74 | | .~.~ Metal compounds or inorganic components (except water) {2} |
| 75 | DF | .~.~.~> Organic compounds of nonmetals other than C, H, and O |
| 76 | DF | .~.~.~> Carboxylic organic compounds containing |