| 252 / | HD | COMPOSITIONS |
| 71 | DF | HEAT-EXCHANGE, LOW-FREEZING OR POUR POINT, OR HIGH BOILING COMPOSITIONS {2} |
| 73 | | .~ Organic components {3} |
| 74 | DF | .~.~> Metal compounds or inorganic components (except water) {2} |
| 77 | DF | .~.~> Organic compounds of nonmetals other than C, H, and O {1} |
| 79 | DF | .~.~> Carboxylic organic compounds containing |