4411.13.60.00 - Not surface covered (except for oil treatment)

This HTS classification, 4411.13.60.00, specifically covers medium density fiberboard (MDF) that is not surface covered, excluding those treated with oil. The critical defining characteristics for this category are the material (wood or other ligneous materials), the manufacturing process (fiberboard, bonded with resins or other organic substances), the density (medium density), and a specific thickness range of exceeding 5 mm but not exceeding 9 mm. The exclusion of "oil treatment" is crucial for accurate classification, distinguishing it from other potentially similar products.

Within the "Other" subcategory at this level, 4411.13.60.00 differentiates itself from its sibling, 4411.13.90. While both fall under medium density fiberboard of the specified thickness range and are not surface covered, the "Other" designation for 4411.13.60.00 implies it does not fit into any more specific sub-classifications within the broader "Other" category at this level. It represents the residual "other" MDF that meets the primary criteria.

As this is a leaf node, there are no further subcategories under 4411.13.60.00. Therefore, the classification hinges entirely on fulfilling all the preceding hierarchical criteria: being medium density fiberboard, with a thickness between 5 mm and 9 mm, and crucially, not having any surface covering or oil treatment. Importers and exporters should meticulously verify the physical characteristics and any treatments applied to the fiberboard to ensure correct classification.