4412.91.31.20 - With a face ply of walnut (Juglans spp.)

This HTS classification covers plywood where the face ply is specifically made from walnut (Juglans spp.). This includes various species of walnut, such as black walnut, but excludes other types of wood. The material is laminated wood, characterized by having at least one outer ply of a tropical wood, and for this specific code, that outer ply is walnut, which does not obscure the grain, texture, or markings of the face ply.

This category is distinct from its siblings primarily by the type of wood used for the face ply. For instance, it is differentiated from 4412.91.31.10, which specifically covers plywood with a face ply of Spanish cedar, and from 4412.91.31.40, which is for mahogany face plies. The defining characteristic here is the presence of walnut as the prominent outer layer of the plywood.

As a leaf node, this classification does not have further subcategories. Therefore, classification into this specific code hinges on the definitive identification of walnut as the face ply material in otherwise qualifying plywood products. Any deviation in the face ply material, such as Spanish cedar, mahogany, or sen, would necessitate classification under the respective sibling categories.