428 / | HD | STOCK MATERIAL OR MISCELLANEOUS ARTICLES |
221 | DF | WEB OR SHEET CONTAINING STRUCTURALLY DEFINED ELEMENT OR COMPONENT {9} |
304.4 | DF | .~ Composite having voids in a component (e.g., porous, cellular, etc.) {14} |
318.4 | .~.~ With nonvoid component of specified composition {3} | |
318.6 | DF | .~.~.~> Of about the same composition as, and adjacent to, the void-containing component {1} |
319.1 | DF | .~.~.~> Inorganic |
319.3 | DF | .~.~.~> Synthetic resin or natural rubbers {1} |