| 428 / | HD | STOCK MATERIAL OR MISCELLANEOUS ARTICLES |
| 221 | DF | WEB OR SHEET CONTAINING STRUCTURALLY DEFINED ELEMENT OR COMPONENT {9} |
| 292.1 | DF | .~ Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity {7} |
| 293.4 | DF | .~.~ Fiber embedded in a ceramic, glass, or carbon matrix {2} |
| 294.4 | | .~.~.~ Free metal or alloy fiber |